If any method called by `MergeService#execute` raises a `MergeError`,
that error's message will be logged, the model will be updated, and the
merge will fail.

Only create unmergeable todos once

Closes #28555

See merge request !9513

Fix migration without DOWNTIME clause specified

See merge request !9571

Make RuboCop happy

See merge request !9554

Add button to create issue for failing build

Closes #25920

See merge request !9391

Fix inline comment images by removing wrapper #20890

Closes #20890

See merge request !5804

Fix broken dev environment in master

See merge request !9557

Keep consistent in handling indexOf results

Closes #28723

See merge request !9531

Add development fixtures for nested groups

See merge request !9553

Replace setInterval with setTimeout to prevent highly frequent requests

Closes #28212

See merge request !9271

[ci skip]

Fix #27840 - Improve the search bar experience on mobile

Closes #27840

See merge request !9280

[ci skip]

Removed jQuery UI draggable

See merge request !8582

Fix webpack dev server when behind proxy

See merge request !9543

[ci skip]

Minor refactoring of Uploaders

See merge request !9490

Align last column buttons with new environment button

Closes #28753

See merge request !9551

Updates SSH key title after pasting key

Closes #28436

See merge request !9481

Add Mock CI service/integration

See merge request !9250

Fixed alignment of RSS button on activity pages

Closes #28572

See merge request !9478

Improved the diff comment button UX

Closes #27543

See merge request !9448

Pipelines tables UI improvements

Closes #28383, #26611, #21788, #27048, and #27828

See merge request !9442

Add runner version to /admin/runners view

See merge request !8733

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

Previously it was listening for focusout, it now listens for blur &
paste events

Closes #28436

Make nested groups deletion synchronous to avoid potential race

See merge request !9288

fix ERR_CONTENT_LENGTH_MISMATCH on task checkboxes

See merge request !8567

Improves backoff algo with maxInterval between requests

See merge request !9548

Update Registry administration doc - external registry

Closes omnibus-gitlab#1361

See merge request !8497

Backport EE http status codes new file to CE

Closes #28721

See merge request !9549

* master: (196 commits)
  Add quotes to coverage pattern
  Update CHANGELOG.md
  Bump omniauth to 1.4.2
  Bump Hashie to 3.5.5 to eliminate warning noise
  use single backticks for inline code
  Add performance query regression fix for !9088 affecting #27267
  Fix spec
  API: Return 400 for all validation erros in the mebers API
  Adds confirmation for cancel button
  Add newline
  Corrected indentation on the template string
  Adds backoff algo from EE to CE
  We don't need these checks anymore
  Raise error when no content is provided
  Address review
  Update API v3 in line with v4
  Fix new offenses
  Fix spec
  Fix specs
  Rename commit_file, commit_dir and remove_file and update specs
  ...

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

Add the username of the current user to the HTTP(S) clone URL

Closes #1937

See merge request !9347