[EE] Add support for Git push options, specifically ci.skip

See merge request gitlab-org/gitlab-ee!8992

gitlab-org/gitlab-shell!166 added support for collecting push options
from the environment, and passing them along to the
/internal/post_receive API endpoint.

This change handles the new push_options JSON element in the payload,
and passes them on through to the GitPushService and GitTagPushService
services.

Futhermore, it adds support for the first push option, ci.skip.  With
this change, one can use 'git push -o ci.skip' to skip CI pipe
execution. Note that the pipeline is still created, but in the "skipped"
state, just like with the 'ci skip' commit message text.

Implements #18667

Update gitlab runner helm chart to 0.1.43

See merge request gitlab-org/gitlab-ce!24083

Bump Ruby on Rails to 5.0.7.1

See merge request gitlab-org/gitlab-ce!23396

Regenerate locale/gitlab.pot

See merge request gitlab-org/gitlab-ee!8991

Resolve "Show the activity filter dropdown in discussion tab only, show all discussions always in changes tab"

Closes #54206

See merge request gitlab-org/gitlab-ce!24082

Resolve "Update `Milestone` sort to say say `Milestone due date`"

Closes #55369

See merge request gitlab-org/gitlab-ce!24080

Use directories.new when getting S3 directory

Closes gitlab-com/gl-infra/infrastructure#5807

See merge request gitlab-org/gitlab-ce!23981

Resolve "User activity is stuck loading when there is none"

Closes #55755

See merge request gitlab-org/gitlab-ce!24063

Upgrade GitLab QA image to Ruby 2.5

See merge request gitlab-org/gitlab-ce!24091

[master] Escape html entities when no label found

See merge request gitlab/gitlabhq!2706

[master] Secret CI variables can exposed by creating a tag with the same name as an existing protected branch

See merge request gitlab/gitlabhq!2596

[master] Set URL rel attribute for broken URLs

See merge request gitlab/gitlabhq!2695

[master] Security todos not redacted for guests

See merge request gitlab/gitlabhq!2697

Remove gem install bundler from Docker-based Ruby environments

Closes #55838

See merge request gitlab-org/gitlab-ce!24093

log text_filter arg of find_element

Closes gitlab-org/quality/nightly#52

See merge request gitlab-org/gitlab-ce!24064

Discussion filters will be hidden on Commits, Pipelines, and
Changes tabs on merge requests page.

This does not affect its behavior on issues page

Updating link to correctly point to environment scope docs

See merge request gitlab-org/gitlab-ce!24023

Update mysql.md - broken link

See merge request gitlab-org/gitlab-ce!23988

Update Geo Architecture Diagram in our documentation

Closes #8592

See merge request gitlab-org/gitlab-ee!7317

Explain how to use kaniko with a registry with a custom certificate

Closes #53656

See merge request gitlab-org/gitlab-ce!23875

Fix failing EE specs in security release

See merge request gitlab/gitlab-ee!753