Fix exempt_from_sharding breaking Org mover

These tables need to be fixed

Pending: (Failures listed here are expected and do not affect your suite's status)

  1) new tables missing sharding_key does not allow tables with FK references to be permanently exempted
     # These tables need to be fixed
     Got 4 failures:

     1.1) Failure/Error:
            expect(fks).to be_empty,
              "#{entry.table_name} is exempted from sharding, but has FK references to it\n" \
              "#{fks.map(&:constrained_table_name).join("\n")}"
          
            clusters is exempted from sharding, but has FK references to it
            metrics_dashboard_annotations
            cluster_projects
            clusters_integration_prometheus
            cluster_groups
          # ./spec/lib/gitlab/database/sharding_key_spec.rb:219:in `block (3 levels) in <top (required)>'
          # ./spec/lib/gitlab/database/sharding_key_spec.rb:211:in `each'
          # ./spec/lib/gitlab/database/sharding_key_spec.rb:211:in `block (2 levels) in <top (required)>'
          # ./spec/spec_helper.rb:454:in `block (3 levels) in <top (required)>'
          # ./lib/gitlab/sidekiq_sharding/validator.rb:42:in `enabled'
          # ./spec/spec_helper.rb:453:in `block (2 levels) in <top (required)>'
          # ./spec/spec_helper.rb:448:in `block (3 levels) in <top (required)>'
          # ./spec/support/sidekiq_middleware.rb:9:in `with_sidekiq_server_middleware'
          # ./spec/spec_helper.rb:439:in `block (2 levels) in <top (required)>'
          # ./spec/spec_helper.rb:435:in `block (3 levels) in <top (required)>'
          # ./lib/gitlab/application_context.rb:86:in `with_raw_context'
          # ./spec/spec_helper.rb:435:in `block (2 levels) in <top (required)>'
          # ./spec/spec_helper.rb:260:in `block (2 levels) in <top (required)>'
          # ./spec/support/system_exit_detected.rb:7:in `block (2 levels) in <main>'
          # ./spec/support/database/prevent_cross_joins.rb:106:in `block (3 levels) in <main>'
          # ./spec/support/database/prevent_cross_joins.rb:60:in `with_cross_joins_prevented'
          # ./spec/support/database/prevent_cross_joins.rb:106:in `block (2 levels) in <main>'

     1.2) Failure/Error:
            expect(lfks).to be_empty,
              "#{entry.table_name} is exempted from sharding, but has LFK references to it\n" \
              "#{lfks.map(&:from_table).join("\n")}"
          
            clusters is exempted from sharding, but has LFK references to it
            deployment_clusters
          # ./spec/lib/gitlab/database/sharding_key_spec.rb:226:in `block (3 levels) in <top (required)>'
          # ./spec/lib/gitlab/database/sharding_key_spec.rb:211:in `each'
          # ./spec/lib/gitlab/database/sharding_key_spec.rb:211:in `block (2 levels) in <top (required)>'
          # ./spec/spec_helper.rb:454:in `block (3 levels) in <top (required)>'
          # ./lib/gitlab/sidekiq_sharding/validator.rb:42:in `enabled'
          # ./spec/spec_helper.rb:453:in `block (2 levels) in <top (required)>'
          # ./spec/spec_helper.rb:448:in `block (3 levels) in <top (required)>'
          # ./spec/support/sidekiq_middleware.rb:9:in `with_sidekiq_server_middleware'
          # ./spec/spec_helper.rb:439:in `block (2 levels) in <top (required)>'
          # ./spec/spec_helper.rb:435:in `block (3 levels) in <top (required)>'
          # ./lib/gitlab/application_context.rb:86:in `with_raw_context'
          # ./spec/spec_helper.rb:435:in `block (2 levels) in <top (required)>'
          # ./spec/spec_helper.rb:260:in `block (2 levels) in <top (required)>'
          # ./spec/support/system_exit_detected.rb:7:in `block (2 levels) in <main>'
          # ./spec/support/database/prevent_cross_joins.rb:106:in `block (3 levels) in <main>'
          # ./spec/support/database/prevent_cross_joins.rb:60:in `with_cross_joins_prevented'
          # ./spec/support/database/prevent_cross_joins.rb:106:in `block (2 levels) in <main>'

     1.3) Failure/Error:
            expect(fks).to be_empty,
              "#{entry.table_name} is exempted from sharding, but has FK references to it\n" \
              "#{fks.map(&:constrained_table_name).join("\n")}"
          
            geo_nodes is exempted from sharding, but has FK references to it
            geo_node_namespace_links
            geo_repositories_changed_events
          # ./spec/lib/gitlab/database/sharding_key_spec.rb:219:in `block (3 levels) in <top (required)>'
          # ./spec/lib/gitlab/database/sharding_key_spec.rb:211:in `each'
          # ./spec/lib/gitlab/database/sharding_key_spec.rb:211:in `block (2 levels) in <top (required)>'
          # ./spec/spec_helper.rb:454:in `block (3 levels) in <top (required)>'
          # ./lib/gitlab/sidekiq_sharding/validator.rb:42:in `enabled'
          # ./spec/spec_helper.rb:453:in `block (2 levels) in <top (required)>'
          # ./spec/spec_helper.rb:448:in `block (3 levels) in <top (required)>'
          # ./spec/support/sidekiq_middleware.rb:9:in `with_sidekiq_server_middleware'
          # ./spec/spec_helper.rb:439:in `block (2 levels) in <top (required)>'
          # ./spec/spec_helper.rb:435:in `block (3 levels) in <top (required)>'
          # ./lib/gitlab/application_context.rb:86:in `with_raw_context'
          # ./spec/spec_helper.rb:435:in `block (2 levels) in <top (required)>'
          # ./spec/spec_helper.rb:260:in `block (2 levels) in <top (required)>'
          # ./spec/support/system_exit_detected.rb:7:in `block (2 levels) in <main>'
          # ./spec/support/database/prevent_cross_joins.rb:106:in `block (3 levels) in <main>'
          # ./spec/support/database/prevent_cross_joins.rb:60:in `with_cross_joins_prevented'
          # ./spec/support/database/prevent_cross_joins.rb:106:in `block (2 levels) in <main>'

     1.4) Failure/Error:
            expect(fks).to be_empty,
              "#{entry.table_name} is exempted from sharding, but has FK references to it\n" \
              "#{fks.map(&:constrained_table_name).join("\n")}"
          
            zoekt_nodes is exempted from sharding, but has FK references to it
            zoekt_indices
            zoekt_tasks
            zoekt_tasks_1
          # ./spec/lib/gitlab/database/sharding_key_spec.rb:219:in `block (3 levels) in <top (required)>'
          # ./spec/lib/gitlab/database/sharding_key_spec.rb:211:in `each'
          # ./spec/lib/gitlab/database/sharding_key_spec.rb:211:in `block (2 levels) in <top (required)>'
          # ./spec/spec_helper.rb:454:in `block (3 levels) in <top (required)>'
          # ./lib/gitlab/sidekiq_sharding/validator.rb:42:in `enabled'
          # ./spec/spec_helper.rb:453:in `block (2 levels) in <top (required)>'
          # ./spec/spec_helper.rb:448:in `block (3 levels) in <top (required)>'
          # ./spec/support/sidekiq_middleware.rb:9:in `with_sidekiq_server_middleware'
          # ./spec/spec_helper.rb:439:in `block (2 levels) in <top (required)>'
          # ./spec/spec_helper.rb:435:in `block (3 levels) in <top (required)>'
          # ./lib/gitlab/application_context.rb:86:in `with_raw_context'
          # ./spec/spec_helper.rb:435:in `block (2 levels) in <top (required)>'
          # ./spec/spec_helper.rb:260:in `block (2 levels) in <top (required)>'
          # ./spec/support/system_exit_detected.rb:7:in `block (2 levels) in <main>'
          # ./spec/support/database/prevent_cross_joins.rb:106:in `block (3 levels) in <main>'
          # ./spec/support/database/prevent_cross_joins.rb:60:in `with_cross_joins_prevented'
          # ./spec/support/database/prevent_cross_joins.rb:106:in `block (2 levels) in <main>'