Prepare ci_builds swap indexes for async creation

What does this MR do?

See #325619 (closed)

Migration up

$ rails db:migrate:up VERSION=20210901184511
== 20210901184511 PrepareAsyncIndexesForCiBuilds: migrating ===================
-- index_exists?(:ci_builds, :stage_id_convert_to_bigint, {:name=>:index_ci_builds_on_converted_stage_id, :algorithm=>:concurrently})
   -> 0.0087s
-- add_index_options(:ci_builds, :stage_id_convert_to_bigint, {:name=>:index_ci_builds_on_converted_stage_id, :algorithm=>:concurrently})
   -> 0.0000s
-- index_exists?(:ci_builds, [:commit_id, :artifacts_expire_at, :id_convert_to_bigint], {:where=>"type::text = 'Ci::Build'::text\n              AND (retried = false OR retried IS NULL)\n              AND (name::text = ANY (ARRAY['sast'::character varying::text,\n                                           'secret_detection'::character varying::text,\n                                           'dependency_scanning'::character varying::text,\n                                           'container_scanning'::character varying::text,\n                                           'dast'::character varying::text]))", :name=>:index_ci_builds_on_commit_id_expire_at_and_converted_id, :algorithm=>:concurrently})
   -> 0.0083s
-- add_index_options(:ci_builds, [:commit_id, :artifacts_expire_at, :id_convert_to_bigint], {:where=>"type::text = 'Ci::Build'::text\n              AND (retried = false OR retried IS NULL)\n              AND (name::text = ANY (ARRAY['sast'::character varying::text,\n                                           'secret_detection'::character varying::text,\n                                           'dependency_scanning'::character varying::text,\n                                           'container_scanning'::character varying::text,\n                                           'dast'::character varying::text]))", :name=>:index_ci_builds_on_commit_id_expire_at_and_converted_id, :algorithm=>:concurrently})
   -> 0.0000s
-- index_exists?(:ci_builds, [:project_id, :id_convert_to_bigint], {:name=>:index_ci_builds_on_project_and_converted_id, :algorithm=>:concurrently})
   -> 0.0069s
-- add_index_options(:ci_builds, [:project_id, :id_convert_to_bigint], {:name=>:index_ci_builds_on_project_and_converted_id, :algorithm=>:concurrently})
   -> 0.0000s
-- index_exists?(:ci_builds, [:runner_id, :id_convert_to_bigint], {:order=>{:id_convert_to_bigint=>:desc}, :name=>:index_ci_builds_on_runner_id_and_converted_id_desc, :algorithm=>:concurrently})
   -> 0.0072s
-- add_index_options(:ci_builds, [:runner_id, :id_convert_to_bigint], {:order=>{:id_convert_to_bigint=>:desc}, :name=>:index_ci_builds_on_runner_id_and_converted_id_desc, :algorithm=>:concurrently})
   -> 0.0000s
-- index_exists?(:ci_builds, [:resource_group_id, :id_convert_to_bigint], {:where=>"resource_group_id IS NOT NULL", :name=>:index_ci_builds_on_resource_group_and_converted_id, :algorithm=>:concurrently})
   -> 0.0080s
-- add_index_options(:ci_builds, [:resource_group_id, :id_convert_to_bigint], {:where=>"resource_group_id IS NOT NULL", :name=>:index_ci_builds_on_resource_group_and_converted_id, :algorithm=>:concurrently})
   -> 0.0000s
-- index_exists?(:ci_builds, [:name, :id_convert_to_bigint], {:where=>"(name::text = ANY (ARRAY['container_scanning'::character varying::text,\n                                       'dast'::character varying::text,\n                                       'dependency_scanning'::character varying::text,\n                                       'license_management'::character varying::text,\n                                       'sast'::character varying::text,\n                                       'secret_detection'::character varying::text,\n                                       'coverage_fuzzing'::character varying::text,\n                                       'license_scanning'::character varying::text])\n                ) AND type::text = 'Ci::Build'::text", :name=>:index_security_ci_builds_on_name_and_converted_id_parser, :algorithm=>:concurrently})
   -> 0.0071s
-- add_index_options(:ci_builds, [:name, :id_convert_to_bigint], {:where=>"(name::text = ANY (ARRAY['container_scanning'::character varying::text,\n                                       'dast'::character varying::text,\n                                       'dependency_scanning'::character varying::text,\n                                       'license_management'::character varying::text,\n                                       'sast'::character varying::text,\n                                       'secret_detection'::character varying::text,\n                                       'coverage_fuzzing'::character varying::text,\n                                       'license_scanning'::character varying::text])\n                ) AND type::text = 'Ci::Build'::text", :name=>:index_security_ci_builds_on_name_and_converted_id_parser, :algorithm=>:concurrently})
   -> 0.0000s
-- index_name_exists?(:ci_builds, :index_ci_builds_runner_id_and_converted_id_pending_covering)
   -> 0.0007s
== 20210901184511 PrepareAsyncIndexesForCiBuilds: migrated (0.0911s) ==========

Migration down

$ rails db:migrate:down VERSION=20210901184511
== 20210901184511 PrepareAsyncIndexesForCiBuilds: reverting ===================
== 20210901184511 PrepareAsyncIndexesForCiBuilds: reverted (0.0215s) ==========

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