Add default branch name e2e test

Closes gitlab-org/quality/testcases#888

See merge request gitlab-org/gitlab!40691

Adds an e2e test of instance-wide default branch name setting
- Includes a test of creating a project from an existing repo

Update ApplicationSettings
- Makes it a class since it's not intended to be included (and this
avoids rubocop complaints about a module with instance variables)
- Allow settings to be restored
- Dedupe API client code

CI Secrets: remove feature flags

See merge request gitlab-org/gitlab!42055

Related to https://gitlab.com/gitlab-org/gitlab/-/issues/243431

Docs: Updated runner capitalization

See merge request gitlab-org/gitlab!42176

Related to: https://gitlab.com/gitlab-org/gitlab/-/issues/233529

Update deprecated software versions to the latest in Laravel CI/CD docs

See merge request gitlab-org/gitlab!42158

Put GraphQL operation name into logs

See merge request gitlab-org/gitlab!41905

Docs: Updated runner capitalization

See merge request gitlab-org/gitlab!42175

Doc: Improve only/except(advanced)

Closes #213650

See merge request gitlab-org/gitlab!41460

Docs: Edited for style and to clarify how the variables work

See merge request gitlab-org/gitlab!41209

Related to: https://gitlab.com/gitlab-org/gitlab/-/issues/233529

Post-merge TW review CSRF token in UsageData API doc

See merge request gitlab-org/gitlab!42071

Corrected the document from the grammar perspective.

See merge request gitlab-org/gitlab!41184

Improve support for description field on CiliumNetworkPolicy

See merge request gitlab-org/gitlab!41722

Update server hook documentation to reflect current defaults

See merge request gitlab-org/gitlab!40734

Docs: Updated runner capitalization

See merge request gitlab-org/gitlab!42139

Docs: Updated runner capitalization

See merge request gitlab-org/gitlab!42142

Update FE webpack prod docs typo

See merge request gitlab-org/gitlab!42067

Update object_storage.md to fix the object store connection using iam

See merge request gitlab-org/gitlab!42165

Filter out incidents in related issues from epics

See merge request gitlab-org/gitlab!41807

- Laravel 5.4 to 8.0
- PHP 7.1 to 7.4
- Debian jessie (8) to buster (9)
Signed-off-by: tnir <takninnovationresearch@gmail.com>

Remove unused .pkgr.yml

See merge request gitlab-org/gitlab!42156

The latest maintenance was in 2016-09 at 570b25c6.
Signed-off-by: tnir <takninnovationresearch@gmail.com>

Remove confidential_epics feature flag (second try)

See merge request gitlab-org/gitlab!41972

Documentation for Show Alert in Environment Index page feature

See merge request gitlab-org/gitlab!41654

This commit adds the documentation and e2e tests.

Docs: Updated runner capitalization

See merge request gitlab-org/gitlab!42150

Related to: https://gitlab.com/gitlab-org/gitlab/-/issues/233529

Safeguard initalizations

See merge request gitlab-org/gitlab!42133

Related to: https://gitlab.com/gitlab-org/gitlab/-/issues/233529

Related to: https://gitlab.com/gitlab-org/gitlab/-/issues/233529

On certain pages, where the performance bar isn't loaded, the
initialization will error out.

Follow-up for product suffixes removal RUN AS-IF-FOSS

See merge request gitlab-org/gitlab!39850

Issue: https://gitlab.com/gitlab-org/gitlab/-/issues/218764
Follow-up for:
https://gitlab.com/gitlab-org/gitlab/-/merge_requests/39717
After merging:
https://gitlab.com/gitlab-org/gitlab/-/merge_requests/39715

* Revert an approximate match in the documentation linter
* Revert an allow_failure: true behavior
* Update a regular expression to remove false-positives in the linter