CE Port of "Setup IDE terminal store for environment checks"

See merge request gitlab-org/gitlab-ce!23575

(CE-port) Resolve "Add subscription table to GitLab.com billing areas"

See merge request gitlab-org/gitlab-ce!23264

Add top padding for nested environment items loading icon

Closes #49450

See merge request gitlab-org/gitlab-ce!23580

Fix deprecation: You are passing an instance of ActiveRecord::Base to find

See merge request gitlab-org/gitlab-ce!23369

Correct link to group clusters docs

See merge request gitlab-org/gitlab-ce!23606

Not project clusters

Resolve "Include tags into pipeline detail view"

Closes #54336

See merge request gitlab-org/gitlab-ce!23364

- This is needed by the Web Terminal to check environment

- Also creates ide_helper for ide_data which can be extended in EE

Fixed expanding diff commit files

Closes #50662

See merge request gitlab-org/gitlab-ce!23591

Add new Korean and Polish proofreaders

See merge request gitlab-org/gitlab-ce!23594

Change container width for project import

See merge request gitlab-org/gitlab-ce!23318

Replace admin sidebar feature spec with view spec

See merge request gitlab-org/gitlab-ce!23551

Add UsageData for group/project clusters

Closes #54886

See merge request gitlab-org/gitlab-ce!23590

Use group clusters when deploying (DeploymentPlatform)

See merge request gitlab-org/gitlab-ce!22308

Resolve "Searching users by the admin panel wipes query when using sort"

Closes #50626

See merge request gitlab-org/gitlab-ce!23439

Removed the merge-train script

See merge request gitlab-org/gitlab-ce!23587

Rename project's pipelines relation

See merge request gitlab-org/gitlab-ce!23353

Fixed multiple discussions getting added to diff lines

Closes gitlab-ee#8195

See merge request gitlab-org/gitlab-ce!23541

Improve help and validation sections of maximum build timeout inputs

Closes #49434

See merge request gitlab-org/gitlab-ce!23586

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/50662

Avoid 500's when serializing legacy diff notes

Closes #54793

See merge request gitlab-org/gitlab-ce!23544

We're moving the automatic merging logic to a separate repository, so
there's no need in keeping this file around.

[ci skip]

[Backport] Extract system check rake task logic

See merge request gitlab-org/gitlab-ce!23395

Closes https://gitlab.com/gitlab-org/gitlab-ee/issues/8195

Resolve "Use read_repository scope on read-only files endpoints"

Closes #54826

See merge request gitlab-org/gitlab-ce!23534

Remove merge:master job entirely

See merge request gitlab-org/gitlab-ce!23585

Apparently disabling it by checking for a variable doesn't actually
disable it.

[ci skip]