Fix project transfer with hashed-storage attachments

Closes gitlab-ee#4056

See merge request gitlab-org/gitlab-ce!15457

Restrict update column in batches for large tables

See merge request gitlab-org/gitlab-ce!15458

Improved the design of the changed files dropdown

Closes #36687

See merge request gitlab-org/gitlab-ce!15367

add_column_with_default is implemented in terms of update_column_in_batches, but
update_column_in_batches can be used independently. Neither of these should be
used on the specified large tables, because they will cause issues on large
instances like GitLab.com.

This also ignores the cop for all existing migrations, renaming
AddColumnWithDefaultToLargeTable where appropriate.

Fix QA test subject address by configuring capybara

Closes gitlab-qa#113

See merge request gitlab-org/gitlab-ce!15446

Remove the selects when counting the last page

Closes #40266

See merge request gitlab-org/gitlab-ce!15456

Add request rate limits

Closes #30053

See merge request gitlab-org/gitlab-ce!14708

Merge branch '40230-groups-gitlab-org-labels-json-redirects-to-groups-gitlab-org-labels-json' into 'master'

Resolve "/groups/gitlab-org/labels.json redirects to /groups/gitlab-org/-/labels/.json"

Closes #40230

See merge request gitlab-org/gitlab-ce!15427

The last page of the first collection is only loaded into memory when
it is being viewed. If it isn't loaded into memory, the `#size` call
triggers a count query.

This `#count` would generate an invalid query if our custom preloaded
counts are included by adding a separate `as count_column` alias on
top of the count aliases. Removing the selects in this case will make
sure a valid `COUNT(*)` is generated.

Closes #36687

Changing OAuth lookup to be case insensitive

Closes #38822

See merge request gitlab-org/gitlab-ce!15312

Fix hashed storage with project transfers to another namespace

Closes gitlab-ee#4056

See merge request gitlab-org/gitlab-ce!15444

Delete empty fork networks

See merge request gitlab-org/gitlab-ce!15373

Optimise getting the pipeline status of commits

See merge request gitlab-org/gitlab-ce!15332

Fix go-import meta data when enabled_git_access_protocol is a blank string

Closes #40256

See merge request gitlab-org/gitlab-ce!15448

Resolve "Performance issues when loading large number of wiki pages"

Closes #34600

See merge request gitlab-org/gitlab-ce!15276

Exports a couple of project related code as es6 modules

See merge request gitlab-org/gitlab-ce!15356

Convert migration to populate latest merge request ID into a background migration

See merge request gitlab-org/gitlab-ce!15440

Add dropdowns documentation

See merge request gitlab-org/gitlab-ce!15396

This is to smear updates over a few hours to avoid causing excessive
replication lag as seen in https://gitlab.com/gitlab-com/infrastructure/issues/3235.

Update database_debugging.md

See merge request gitlab-org/gitlab-ce!15434

Replace ci_status_path with pipeline_path

See merge request gitlab-org/gitlab-ce!15369

De-duplicate background migration matchers defined in spec/support/migrations_helpers.rb

See merge request gitlab-org/gitlab-ce!15441