Update templates - 8.16 RC1

See merge request !8505

Fix Rubocop configuration files to avoid CE to EE merge problems

See merge request !8525

Updated Turbolinks to patched version of turbolinks-classic

See https://dev.gitlab.org/gitlab/gitlabhq/merge_requests/2048

Clarify instructions for importing Wiki/Merge Request data

See merge request !8075

Display project avatars on Admin Area and Projects pages for mobile views

See merge request !8506

26504 Fix styling of MR jump to discussion button

Closes #26504

See merge request !8511

[ci skip]

[ci skip]

Fix Rubocop offenses on `master`

See merge request !8516

fix changelog entry for !8425

See merge request !8512

Update rubocop and rubocop-rspec to fix build errors

See merge request !8466

Restore backup correctly when "BACKUP" environment variable is passed

Closes #26090

See merge request !8477

the author and mr fields got swapped,
see https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/8425#note_21021254

Treat environments matching `production/*` as Production for Cycle Analytics

Closes #24139

See merge request !8500

Resolve "Add link to Branches page help text?"

Closes #26129

See merge request !8377

[ci skip]

Pipelines Vue

See merge request !7196

Validate label's title length

See merge request !5767

Update the gitlab-markup gem to the version `1.5.1`

See merge request !8509

Remove the project_authorizations.id column

See merge request !8479

Change CI template linter textarea with Ace Editor

Closes #24179 and #19701

See merge request !8452

Use #parts instead of #part to read all the parts of the Message.

Closes #26463

See merge request !8507

Make play button on Pipelines page accessible via keyboard

See merge request !8496

Resolve "Certain buttons are not accessible via the keyboard (Web)"

Closes #26238

See merge request !8469

View spec for Ryancharris/gitlab milestone counter number with delimiter

See merge request !8482

Made download artifacts button accessible via keyboard

Closes #26446

See merge request !8493

Looks like I was accidentally using #part which was adding an extra
empty Mime section