More specificity and clarity for iid field in API documentation.

Closes gitlab-ee#7019

See merge request gitlab-org/gitlab-ce!21490

Resolve "Add functionality to change what email address online actions commit using"

Closes #23986

See merge request gitlab-org/gitlab-ce!21598

Correct a typo in the User Status API docs

See merge request gitlab-org/gitlab-ce!21729

Resolve "Remove images from todos"

Closes #31887

See merge request gitlab-org/gitlab-ce!21704

Revert "Merge branch 'dz-add-project-id-to-jupyter' into 'master'"

See merge request gitlab-org/gitlab-ce!21722

Feature: State filter for admin runners view

See merge request gitlab-org/gitlab-ce!19625

Filter group milestones based on user membership.

See merge request gitlab-org/gitlab-ce!21660

Create specs for diffs/components/app and update modules to export factory functions

Closes #49329

See merge request gitlab-org/gitlab-ce!21685

Enable frozen string in app/graphql + app/finders

See merge request gitlab-org/gitlab-ce!21681

Update Gitlay server version to 0.121.0

See merge request gitlab-org/gitlab-ce!21725

Fixed resolved discussions not toggling expanded on changes tab

Closes #51370

See merge request gitlab-org/gitlab-ce!21676

Fix column differences in `db/schema.rb`

See merge request gitlab-org/gitlab-ce!21718

This reverts merge request !21341

Add project to jupyter cluster app factory spec

See merge request gitlab-org/gitlab-ce!21717

Document abstraction levels and code reuse

See merge request gitlab-org/gitlab-ce!21254

By default, we now strip images in the 'first_line_in_markdown'
method.  This keeps images from being displayed in the
one-liner of both todo and project activity panels.

Although not currently used, we allow images to be preserved
with the allow_images: true options.

This is based on the discussion in
https://gitlab.com/gitlab-org/gitlab-ce/issues/49653 and the example
merge request found at
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/20908. The idea
is fairly straightforward: we define a variety of abstractions, then
state which can reuse which. This should ultimately foster _better_ code
reuse, make it easier to debug problems, and make it harder to
accidentally introduce a performance regression.

Add RuboCop cops to enforce code reusing rules

See merge request gitlab-org/gitlab-ce!21391

Enable omniauth by default

Closes #49990

See merge request gitlab-org/gitlab-ce!21700

Display click to expand on collapsed diffs

Closes #51466

See merge request gitlab-org/gitlab-ce!21716

project_custom_attributes and group_custom_attributes used datetime
instead of datetime_with_timezone column type in database schema. But
actually migration defines `t.timestamps_with_timezone`.

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Merge branch '50808-choosing-initialize-repo-with-a-readme-breaks-project-created-from-template' into 'master'

Resolve "Choosing “Initialize repo with a README” breaks project created from template"

Closes #50808

See merge request gitlab-org/gitlab-ce!21646

Vendor Auto-DevOps.gitlab-ci.yml: fix where the deploy job does not wait for Deployment to complete.

Closes #50186 and charts/auto-deploy-app#6

See merge request gitlab-org/gitlab-ce!21713

Vendor Auto-DevOps.gitlab-ci.yml for refactor to create registry_login() function.

Closes #51450

See merge request gitlab-org/gitlab-ce!21714

Fix route deprecation warnings in rails 5

See merge request gitlab-org/gitlab-ce!21684

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/51370

Merge branch '42861-move-include-external-files-in-gitlab-ci-yml-from-starter-to-libre' into 'master'

Resolve "Move "include external files in .gitlab-ci.yml" from Starter to Libre"

Closes #42861

See merge request gitlab-org/gitlab-ce!21603

Vendors in Auto-DevOps.gitlab-ci.yml from
https://gitlab.com/gitlab-org/gitlab-ci-yml/merge_requests/195

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/50186

Vendor Auto-DevOps.gitlab-ci.yml from https://gitlab.com/gitlab-org/gitlab-ci-yml/merge_requests/193

Thanks @LaurentGoderre, for your contribution !