CE backport of changes that introduce custom instance-level templates to EE

See merge request gitlab-org/gitlab-ce!21530

Bump browser gem to v2.5.3

See merge request gitlab-org/gitlab-ce!21547

Full list of changes: https://github.com/fnando/browser/blob/master/CHANGELOG.md

Add route information to lograge structured logging for API logs

Closes #50993

See merge request gitlab-org/gitlab-ce!21487

Fix documentation on upgrading when using a Helm chart

See merge request gitlab-org/gitlab-ce!21539

Add support for advanced CI/CD config extension with `extends:`

Closes gitlab-ee#6136

See merge request gitlab-org/gitlab-ce!21243

Fix multipart error on rails reload

See merge request gitlab-org/gitlab-ce!21540

remove comma

See merge request gitlab-org/gitlab-ce!21536

Merge branch '45938-postgres-timeout-when-counting-number-of-ci-builds-for-usage-ping' into 'master'

Resolve "Postgres timeout when counting number of CI builds for usage ping"

Closes #45938

See merge request gitlab-org/gitlab-ce!21523

Document that when updating using a Helm chart 'helm repo update' needs to be run before the 'helm upgrade ...' command.  

then each commit or push triggers your CI pipeline. 

Remove unnecessary logic from group labels page

See merge request gitlab-org/gitlab-ce!21518

Merge branch '50974-qa-group-filtering-fails-when-filter-text-field-is-filled-before-the-group-list-is-fully-loaded-leading-to-path-has-already-been-taken-error-qa-tries-to-create-a-bew-subgroup-qa' into 'master'

Resolve "[QA] Group filtering fails when filter text field is filled before the group list is fully loaded leading to "Path has already been taken" error QA tries to create a bew subgroup"

Closes #50974

See merge request gitlab-org/gitlab-ce!21475

Filter web hooks by branch

See merge request gitlab-org/gitlab-ce!19513

Signed-off-by: Rémy Coutable <remy@rymai.me>

Resolve "Return how many commits the source branch is behind the target branch through the API"

Closes #36534

See merge request gitlab-org/gitlab-ce!21405

Ignore irrelevant sql commands in metrics

Closes #51005

See merge request gitlab-org/gitlab-ce!21498

Rails 5: fix hashed_path? method that looks up file_location that doesn't exist…

See merge request gitlab-org/gitlab-ce!21510

Add license info of unknown libraries to license_finder configuration instead of direct approval

See merge request gitlab-org/gitlab-ce!21516

Ensure the project has a repository in spec/features/merge_request/user_sees_breadcrumb_links_spec.rb

See merge request gitlab-org/gitlab-ce!21519

Resolve "<link href=""> and <a href=""> not properly filled in activity RSS feed"

Closes #50823

See merge request gitlab-org/gitlab-ce!21424