Send required object storage PUT headers in /uploads/authorize API

See merge request gitlab-org/gitlab-ce!21319

Fix bugs/edge cases of JUnitParser

Closes #50960

See merge request gitlab-org/gitlab-ce!21469

Rails 5: support schema t.index for mysql

See merge request gitlab-org/gitlab-ce!21485

Fix wording in Danger warning about MRs to non-master

See merge request gitlab-org/gitlab-ce!21493

Unused CSS part exists in mobile CSS framework

Closes #50879

See merge request gitlab-org/gitlab-ce!21439

Set issuable_sort and diff_view cookies to secure when possible

Closes #49120

See merge request gitlab-org/gitlab-ce!21442

Uploads to wiki stored inside the wiki git repository

Closes #33475

See merge request gitlab-org/gitlab-ce!21362

Fix QA ObjectStorage not inheriting from Test::Instance::All

See merge request gitlab-org/gitlab-ce!21494

If it's most of the time, then it's not all.

Disable Web IDE button if user is not allowed to push the source branch.

Closes #45026

See merge request gitlab-org/gitlab-ce!21288

Add artifact information in job API

See merge request gitlab-org/gitlab-ce!21328

Closes #49120

Make cache vs artifacts section more visible, and minor enhancements to text.

See merge request gitlab-org/gitlab-ce!21491

Resolve "Should we still use Flay?"

Closes #44750

See merge request gitlab-org/gitlab-ce!21476