Adjust 404's for LegacyDiffNote discussion rendering

Closes #44295

See merge request gitlab-org/gitlab-ce!18201

Merge branch 'docs-45003-route-repository-commits-sha-merge_requests-is-broken-always-returns-404' into 'master'

Mention when "/commits/:sha/merge_requests/" endpoint was introduced

Closes #45003

See merge request gitlab-org/gitlab-ce!18205

Resolve "Consider removing RuboCop and ESLint from `.codeclimate.yml`"

Closes #44978

See merge request gitlab-org/gitlab-ce!18178

Update GitLab Pages

See merge request gitlab-org/gitlab-ce!18203

Resolve HTML/CSS inconsistent comment forms on Issue and Merge Request

Closes #44870

See merge request gitlab-org/gitlab-ce!18120

Change IDE diff view responsively

Closes #44305

See merge request gitlab-org/gitlab-ce!18049

Merge branch '43098-controller-projects-issuescontroller-show-executes-more-than-100-sql-queries' into 'master'

Resolve "Controller Projects::IssuesController#show executes more than 100 SQL queries"

Closes #43098

See merge request gitlab-org/gitlab-ce!17986

Allow passing params to import API to override project attributes

Closes gitlab-ee#4788

See merge request gitlab-org/gitlab-ce!18086

Since we can regenerate `description_html` from the `description`, we
should not export it. This avoids some complexity when overriding the
description during an import/export where we would need to invalidate
this cached field.

Now we refresh the markdown cache after the import

Use chronic duration attribute for project build timeout

See merge request gitlab-org/gitlab-ce!17386

read_project can be prevented by a very expensive condition, which we want to
avoid, while still not writing manual SQL queries. read_project_for_iids is used
by read_issue_iid and read_merge_request_iid to satisfy both of those
constraints, and allow the declarative policy runner to use its normal caching
strategy.

Better group support in notes-related code

See merge request gitlab-org/gitlab-ce!18150

JaCoCo example

See merge request gitlab-org/gitlab-ce!17969

Reschedule pipeline stages migration to run it again

See merge request gitlab-org/gitlab-ce!18191

Updates notes-related services and rendering so this code can be
easily used for group-scoped resources (specifically Epics).

Related to gitlab-ee!5205

Web IDE markdown preview

Closes #44843

See merge request gitlab-org/gitlab-ce!18059

Allow to store uploads by default on Object Storage

See merge request gitlab-org/gitlab-ce!18156

Ensure internal users (ghost, support bot) get assigned a namespace

See merge request gitlab-org/gitlab-ce!18194

Resolve "Coverage information for this repo is wrong"

Closes #44710

See merge request gitlab-org/gitlab-ce!18193

Add custom additional text to emails -- CE backport

Closes gitlab-ee#4474

See merge request gitlab-org/gitlab-ce!18183

Changed IDE sidebar min width

Closes #44836

See merge request gitlab-org/gitlab-ce!18123

Merge security fixes to master

See merge request gitlab/gitlabhq!2369