…in Groups::UpdateService instead of only in the browser.

…when needed

…based on whether the current user owns the parent group and whether the parent group or current group is share locked.

Fix 422 error when retry job

Closes #33281

See merge request !14082

Wiki table of contents are now properly nested to reflect header level

See merge request !13909

Migrate creating/deleting a branch to Gitaly

See merge request !13864

Fixed sidebar icon size in ie11

Closes #37512

See merge request !14080

Resolve "Projects::CommitsController#show is slow partially due to SQL queries"

Closes #34509

See merge request !13762

Clarify documentation about performance bar

[ci skip]

See merge request !14085

First time contributor badge

Closes #35161

See merge request !13902

Now the instance variable assignment is all contained within
`#initialize`, and the `children.push` behavior is more explicit.

Most of the logic is now self-contained within the `HeaderNode` class.