Move exclusions for RSpec/LeakyConstantDeclaration to .rubocop_todo

What does this MR do and why?

This MR moves exclusions for 👮 RuboCop rule RSpec/LeakyConstantDeclaration from .rubocop.yml to .rubocop_todo/ so revealing RuboCop TODOs via REVEAL_RUBOCOP_TODO=1 expose those offense correctly.

Contributes to #211580.

How to set up and validate locally

With REVEAL_RUBOCOP_TODO=1

$ REVEAL_RUBOCOP_TODO=1 bundle exec rubocop --only RSpec/LeakyConstantDeclaration spec/db/schema_spec.rb spec/lib/g
itlab/config/entry/simplifiable_spec.rb spec/lib/gitlab/quick_actions/dsl_spec.rb spec/lib/marginalia_spec.rb spec/
mailers/notify_spec.rb spec/models/concerns/batch_destroy_dependent_associations_spec.rb spec/models/concerns/bulk_
insert_safe_spec.rb spec/models/concerns/bulk_insertable_associations_spec.rb spec/models/concerns/triggerable_hook
s_spec.rb spec/models/repository_spec.rb spec/services/clusters/applications/check_installation_progress_service_sp
ec.rb spec/support/shared_examples/quick_actions/issuable/issuable_quick_actions_shared_examples.rb
Inspecting 12 files
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Offenses:

spec/db/schema_spec.rb:15:3: C: RSpec/LeakyConstantDeclaration: Stub constant instead of declaring explicitly.
  IGNORED_FK_COLUMNS = { ...
  ^^^^^^^^^^^^^^^^^^^^^^
spec/db/schema_spec.rb:146:3: C: RSpec/LeakyConstantDeclaration: Stub constant instead of declaring explicitly.
  IGNORED_LIMIT_ENUMS = { ...
  ^^^^^^^^^^^^^^^^^^^^^^^
spec/db/schema_spec.rb:193:3: C: RSpec/LeakyConstantDeclaration: Stub constant instead of declaring explicitly.
  IGNORED_JSONB_COLUMNS = { ...
  ^^^^^^^^^^^^^^^^^^^^^^^^^
spec/lib/gitlab/config/entry/simplifiable_spec.rb:27:7: C: RSpec/LeakyConstantDeclaration: Stub constant instead of declaring explicitly.
      entry::Something = first
      ^^^^^^^^^^^^^^^^^^^^^^^^
spec/lib/gitlab/config/entry/simplifiable_spec.rb:28:7: C: RSpec/LeakyConstantDeclaration: Stub constant instead of declaring explicitly.
      entry::DifferentOne = second
      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
spec/lib/gitlab/config/entry/simplifiable_spec.rb:29:7: C: RSpec/LeakyConstantDeclaration: Stub constant instead of declaring explicitly.
      entry::UnknownStrategy = unknown
      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
spec/lib/gitlab/quick_actions/dsl_spec.rb:7:5: C: RSpec/LeakyConstantDeclaration: Stub constant instead of declaring explicitly.
    DummyClass = Struct.new(:project) do ...
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
spec/lib/marginalia_spec.rb:6:3: C: RSpec/LeakyConstantDeclaration: Stub class constant instead of declaring explicitly.
  class MarginaliaTestController < ApplicationController ...
  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
spec/lib/marginalia_spec.rb:21:3: C: RSpec/LeakyConstantDeclaration: Stub class constant instead of declaring explicitly.
  class MarginaliaTestJob ...
  ^^^^^^^^^^^^^^^^^^^^^^^
spec/lib/marginalia_spec.rb:31:3: C: RSpec/LeakyConstantDeclaration: Stub class constant instead of declaring explicitly.
  class MarginaliaTestMailer < ApplicationMailer ...
  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
spec/mailers/notify_spec.rb:523:9: C: RSpec/LeakyConstantDeclaration: Stub class constant instead of declaring explicitly.
        class TopLevelThing ...
        ^^^^^^^^^^^^^^^^^^^
spec/mailers/notify_spec.rb:546:9: C: RSpec/LeakyConstantDeclaration: Stub module constant instead of declaring explicitly.
        module Namespaced ...
        ^^^^^^^^^^^^^^^^^
spec/mailers/notify_spec.rb:547:11: C: RSpec/LeakyConstantDeclaration: Stub class constant instead of declaring explicitly.
          class Thing ...
          ^^^^^^^^^^^
spec/models/concerns/batch_destroy_dependent_associations_spec.rb:6:3: C: RSpec/LeakyConstantDeclaration: Stub class constant instead of declaring explicitly.
  class TestProject < ActiveRecord::Base ...
  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
spec/models/concerns/bulk_insert_safe_spec.rb:42:3: C: RSpec/LeakyConstantDeclaration: Stub constant instead of declaring explicitly.
  BulkInsertParentItem = Class.new(ActiveRecord::Base) do ...
  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
spec/models/concerns/bulk_insertable_associations_spec.rb:6:3: C: RSpec/LeakyConstantDeclaration: Stub class constant instead of declaring explicitly.
  class BulkFoo < ApplicationRecord ...
  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
spec/models/concerns/bulk_insertable_associations_spec.rb:14:3: C: RSpec/LeakyConstantDeclaration: Stub class constant instead of declaring explicitly.
  class BulkBar < ApplicationRecord ...
  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
spec/models/concerns/bulk_insertable_associations_spec.rb:20:3: C: RSpec/LeakyConstantDeclaration: Stub constant instead of declaring explicitly.
  SimpleBar = Class.new(ApplicationRecord) do ...
  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
spec/models/concerns/bulk_insertable_associations_spec.rb:24:3: C: RSpec/LeakyConstantDeclaration: Stub class constant instead of declaring explicitly.
  class BulkParent < ApplicationRecord ...
  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
spec/models/concerns/triggerable_hooks_spec.rb:7:5: C: RSpec/LeakyConstantDeclaration: Stub class constant instead of declaring explicitly.
    class TestableHook < WebHook ...
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
spec/models/repository_spec.rb:9:3: C: RSpec/LeakyConstantDeclaration: Stub constant instead of declaring explicitly.
  TestBlob = Struct.new(:path)
  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
spec/services/clusters/applications/check_installation_progress_service_spec.rb:6:3: C: RSpec/LeakyConstantDeclaration: Stub constant instead of declaring explicitly.
  RESCHEDULE_PHASES = Gitlab::Kubernetes::Pod::PHASES - [Gitlab::Kubernetes::Pod::SUCCEEDED, Gitlab::Kubernetes::Pod::FAILED].freeze
  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
spec/support/shared_examples/quick_actions/issuable/issuable_quick_actions_shared_examples.rb:4:3: C: RSpec/LeakyConstantDeclaration: Stub constant instead of declaring explicitly.
  QuickAction = Struct.new(:action_text, :expectation, :before_action, keyword_init: true) do ...
  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

12 files inspected, 23 offenses detected

With

$ REVEAL_RUBOCOP_TODO=0 bundle exec rubocop --only RSpec/LeakyConstantDeclaration spec/db/schema_spec.rb spec/lib/g
itlab/config/entry/simplifiable_spec.rb spec/lib/gitlab/quick_actions/dsl_spec.rb spec/lib/marginalia_spec.rb spec/
mailers/notify_spec.rb spec/models/concerns/batch_destroy_dependent_associations_spec.rb spec/models/concerns/bulk_
insert_safe_spec.rb spec/models/concerns/bulk_insertable_associations_spec.rb spec/models/concerns/triggerable_hook
s_spec.rb spec/models/repository_spec.rb spec/services/clusters/applications/check_installation_progress_service_sp
ec.rb spec/support/shared_examples/quick_actions/issuable/issuable_quick_actions_shared_examples.rb
Inspecting 12 files
............

12 files inspected, no offenses detected

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