Fix #47913 (again), revert !21180, fix regression of !8652, improve !20137

Resolve "Error getting performance bar results for <UUID>"

Closes #50801

See merge request gitlab-org/gitlab-ce!21411

This isn't interesting most of the time and is may go over other flash banners.

These don't have performance data saved as they use Grape.

Rails 5: replace removed silence_stream

See merge request gitlab-org/gitlab-ce!21387

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Previously, this wasn't needed: text was normally set to the highlighted
contents anyway. Now, it is: we store different things in text and rich_text.

This caused https://gitlab.com/gitlab-com/production/issues/439.

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Closes https://gitlab.com/gitlab-com/migration/issues/766

When backend sends HTML it requires frontend to append it to the DOM causing
XSS vulnerabilities. By removing the `<br>` we avoid those vulnerabilities

Backport `Repository#keep_around` changes from EE to CE

See merge request gitlab-org/gitlab-ce!21290

[master] Resolve "Orphaned upload files are accessible via project exports"

Closes #2695

See merge request gitlab/gitlabhq!2453

[master] Fixed persistent XSS rendering/escaping of diff location lines

See merge request gitlab/gitlabhq!2463

Block link-local addresses in URLBlocker

See merge request gitlab/gitlabhq!2459

[master] Removes `<br>` sent from backend on tooltips in jobs

See merge request gitlab/gitlabhq!2455

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[master] Include rich_text in diff cache keys

See merge request gitlab/gitlabhq!2481

Previously, this wasn't needed: text was normally set to the highlighted
contents anyway. Now, it is: we store different things in text and rich_text.

This caused https://gitlab.com/gitlab-com/production/issues/439.

Change large scale to production

See merge request gitlab-org/gitlab-ce!21331

Merge branch '50441-high-number-of-statement-timeouts-in-groupdestroyworker-due-to-sitestatistics' into 'master'

Resolve "High number of statement timeouts in GroupDestroyWorker due to SiteStatistics"

Closes #50441

See merge request gitlab-org/gitlab-ce!21366

Fix static analysis

See merge request gitlab-org/gitlab-ce!21402

Rails5: fix can't quote ActiveSupport::HashWithIndifferentAccess

See merge request gitlab-org/gitlab-ce!21397

Allow date parameters on Issues, Notes, and Discussions API for group owners

Closes #40059

See merge request gitlab-org/gitlab-ce!21342

Display default status emoji if only message is entered

Closes #50067

See merge request gitlab-org/gitlab-ce!21330

Resolve "It's impossible to commit twice to the same branch"

Closes #50584

See merge request gitlab-org/gitlab-ce!21372

Expose user's id in /admin/users/ show page.

See merge request gitlab-org/gitlab-ce!21297

Creates vue component for environments block

See merge request gitlab-org/gitlab-ce!21279