Support both integer and string as epic count key

Closes #8824

See merge request gitlab-org/gitlab-ee!8840

Remove the project_cleanup feature flag

Closes #55230

See merge request gitlab-org/gitlab-ce!23814

Clarify messaging on what fails for too many failed lines

See merge request gitlab-org/gitlab-ce!23862

Fixed duplicated inline diff discussions

Closes #55388

See merge request gitlab-org/gitlab-ce!23843

Change `page_filter_path` to not exclude `label_name` by default

See merge request gitlab-org/gitlab-ce!23825

EE port of update-page-filter-path-defaults

See merge request gitlab-org/gitlab-ee!8851

Fix deprecation: Comparing equality between ActionController::Parameters and a Hash is deprecated

See merge request gitlab-org/gitlab-ce!23855

Remove deprecated ActionDispatch::ParamsParser

See merge request gitlab-org/gitlab-ce!23848

Merge branch '55433-un-revert-https-gitlab-com-gitlab-org-gitlab-ce-commit-00acef43-revert' into 'master'

Resolve "Un-revert https://gitlab.com/gitlab-org/gitlab-ce/commit/00acef434031b5dc0bf39576a9e83802c7806842 revert"

Closes #55433

See merge request gitlab-org/gitlab-ce!23861

Resolve "User profile page: Enhance horizonal whitespace between Overview columns"

Closes #55252

See merge request gitlab-org/gitlab-ce!23803

Epic state uses enum for saving state (other issuables use
string), because of this inconsistency we override `count_key`
which should return state as string converted to symbol
(.e.g. :closed). In rails 5 these integer states are automatically
converted to strings by Active Record.

But if subquery is used (to optimize searching), Active Record doesn't
convert state into string automatically (probably it can not deal with
the more complex query).

This means that epic state can be either integer (if subquery is used)
or string (if AR converted state to string automatically), so in
`count_key` we should convert state into string only if it's an integer.

Remove rails4 specific code

See merge request gitlab-org/gitlab-ce!23847

EE: Remove rails4 specific code

See merge request gitlab-org/gitlab-ee!8870

Document omnibus config for smartcard auth

See merge request gitlab-org/gitlab-ee!8795

Clearly state web terminal is not supported at all on GitLab.com

See merge request gitlab-org/gitlab-ce!23821

Docs: follow up from "Clearly state web terminal is not supported at all on GitLab.com"

Closes #8866

See merge request gitlab-org/gitlab-ee!8866

Merge branch 'docs/8884-update-group-security-dashboard-documentation-to-remove-auto-devops-incompatibility' into 'master'

Resolve "Update Group Security Dashboard documentation to remove Auto DevOps incompatibility"

Closes #8884

See merge request gitlab-org/gitlab-ee!8878

Show clusters of ancestors in cluster list page

Closes #34758

See merge request gitlab-org/gitlab-ce!22996

Resolve "Encoding issue with the user centric tooltips"

Closes #55276

See merge request gitlab-org/gitlab-ce!23794

Passing the separator argument as a positional parameter is deprecated

See merge request gitlab-org/gitlab-ce!23334

Remove unnecessary warning and add other minor improvements

See merge request gitlab-org/gitlab-ee!8722

Added Cop for injecting EE modules

See merge request gitlab-org/gitlab-ce!23802

EE: Added Cop for injecting EE modules

See merge request gitlab-org/gitlab-ee!8843

CE-EE parity for prepare_build script

See merge request gitlab-org/gitlab-ce!23819

[EE] CE-EE parity for prepare_build script

See merge request gitlab-org/gitlab-ee!8846

Add Registry S3 chunksize troubleshooting section

See merge request gitlab-org/gitlab-ce!23841

Fix RSpec/HookArgument rubocop offense

See merge request gitlab-org/gitlab-ce!23776

Fix RSpec/HookArgument rubocop offense

See merge request gitlab-org/gitlab-ee!8856