Upgrade gitlab-shell to 9.2.0

See merge request gitlab-org/gitlab-ce!28372

Add haml-lint.yml to FE for roulette

See merge request gitlab-org/gitlab-ce!28301

Parallelize the RSpec Geo jobs

See merge request gitlab-org/gitlab-ee!12688

Main change is to bump .ruby-version to 2.6.3 so versions
are consistent for the GDK.

Resolve CE/EE diffs in admin user access levels

Closes gitlab-ee#10507

See merge request gitlab-org/gitlab-ce!28359

Resolve CE/EE diffs in admin user access levels

Closes #10507

See merge request gitlab-org/gitlab-ee!12781

Resolve CE/EE diffs in mirror repos settings

Closes gitlab-ee#11036

See merge request gitlab-org/gitlab-ce!28361

Explain render_if_exists opts caveat

See merge request gitlab-org/gitlab-ce!28366

Destroy component instances in environments dashboard tests

Closes #11443

See merge request gitlab-org/gitlab-ee!12644

Resolve "Broken master due to `locale/gitlab.pot`"

Closes #11627

See merge request gitlab-org/gitlab-ee!12802

Document what to do if review jobs keep failing

See merge request gitlab-org/gitlab-ce!28367

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

CE backport of "Configure the number of ES shards and replicas"

See merge request gitlab-org/gitlab-ce!28329

Make the number of ES shards and replicas configurable

Closes #2087

See merge request gitlab-org/gitlab-ee!12713

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

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

Omit max-count for diverging_commit_counts behind feature flag

See merge request gitlab-org/gitlab-ce!28157

Add a missing string in locale/gitlab.pot

See merge request gitlab-org/gitlab-ee!12792

Changed the placeholder text of the diff tree filter input

Closes #58339

See merge request gitlab-org/gitlab-ce!28352

Disallow the review-deploy and review-qa-smoke jobs to fail

See merge request gitlab-org/gitlab-ce!28314

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

Add :registrations_recaptcha feature flag

Closes gitlab-ee#11389

See merge request gitlab-org/gitlab-ce!28296

Add :registrations_recaptcha feature flag

See merge request gitlab-org/gitlab-ee!12652

Part of single codebase changes.

Fix. db:migrate is failed on MySQL 8

See merge request gitlab-org/gitlab-ce!28351

Resolve "Error 500 viewing admin/projects page: undefined method `storage_size' for nil:NilClass"

Closes #49915

See merge request gitlab-org/gitlab-ce!28355