[QA] Re-add Test::Instance for back-compatibility with GitLab < 11.3

See merge request gitlab-org/gitlab-ce!21339

Add Test plan issue template

See merge request gitlab-org/gitlab-ce!21227

Resolve "Follow up to "Styling of the MR widget's info and pipeline sections""

Closes #49110

See merge request gitlab-org/gitlab-ce!21206

API: Protected tags

Closes #39144

See merge request gitlab-org/gitlab-ce!14986

Feature flag to disable Hashed Storage migration when renaming a repository

Closes #50345

See merge request gitlab-org/gitlab-ce!21291

Drop WIP from changelog command in Danger comment

See merge request gitlab-org/gitlab-ce!21374

Refactor project_permissions_panel_data so it can be extended in EE easily

See merge request gitlab-org/gitlab-ce!21370

Refactor GitHub Importer database helpers into helper methods

See merge request gitlab-org/gitlab-ce!21357

Removing not necessarily indentations in update Ruby code block

See merge request gitlab-org/gitlab-ce!21364

[docs] Update CONTRIBUTING.md

See merge request gitlab-org/gitlab-ce!21355

POST should be PUT in the API labels specs

See merge request gitlab-org/gitlab-ce!21369

This in preparation for addressing idle-in-transaction timeouts for other importers.

Part of #50021

Add link to Profiling doc to README

See merge request gitlab-org/gitlab-ce!21345

Allows author to vote on their own issue

See merge request gitlab-org/gitlab-ce!21203

documentation: fixes to source installation instructions

Closes #47483

See merge request gitlab-org/gitlab-ce!21359

Fix remote mirrors failing if Git remotes have not been added

Closes #50562

See merge request gitlab-org/gitlab-ce!21351

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

Fix transient failure of badge_list_spec.js

See merge request gitlab-org/gitlab-ce!21363

Backport LDAP changes to CE

See merge request gitlab-org/gitlab-ce!21361

Merge branch '43096-controller-projects-issuescontroller-referenced_merge_requests-json-executes-more-than-100-sql-queries' into 'master'

Resolve "Controller Projects::IssuesController#referenced_merge_requests.json executes more than 100 SQL queries"

Closes #43096

See merge request gitlab-org/gitlab-ce!21237

Finish cleaning up reassigned variables

Closes #49807

See merge request gitlab-org/gitlab-ce!21349

Fixes doc/development/architecture.md prod links.

See merge request gitlab-org/gitlab-ce!20455

"/home/git/repositories" in arguments causes Gitaly installation to fail

Speed up diff comparisons by limiting number of commit messages rendered

See merge request gitlab-org/gitlab-ce!21335

Added count for label, assignee, and milestone lists

Closes #48800

See merge request gitlab-org/gitlab-ce!21208

Add public/uploads/tmp to allowed upload paths

Closes #49585

See merge request gitlab-org/gitlab-ce!20942

Remote mirrors only get created when the URL changes, However, during the GCP
migration, the remote mirror did not get created automatically. Plus, there's
no guarantee someone restoring a repository from backup would have this
remote. We now add the remote each time we attempt to fetch from the
repository.

This works because Gitaly doesn't throw up an exception or error if the
remote already exists:
https://gitlab.com/gitlab-org/gitaly/issues/1317

In the future, we should attempt to add if the remote doesn't exist:
https://gitlab.com/gitlab-org/gitaly/issues/1316

Closes #50562

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