Backport 'Rebase' feature from EE to CE

See merge request gitlab-org/gitlab-ee!3890

API for epic issues

Closes #4250

See merge request gitlab-org/gitlab-ee!3907

Add group boards API endpoint

Closes #3413

See merge request gitlab-org/gitlab-ee!3663

Fix import project url not updating project name -- EE

See merge request gitlab-org/gitlab-ee!3911

New Crowdin translations

See merge request gitlab-org/gitlab-ee!3930

Some UI polish on Geo pages

Closes #4425

See merge request gitlab-org/gitlab-ee!3863

Resolve "Show DAST results in the MR widget"

Closes #4348

See merge request gitlab-org/gitlab-ee!3885

Use geo-nodes sprite icon where appropriate:
Instead of using the fontawesome globe icon, use the geo-nodes icon
for Geo related action.

Closes gitlab-org/gitlab-ee#4425.

Modify `LDAP::Person` to return username value based on attributes

See merge request gitlab-org/gitlab-ee!3915

When a project uses fast-forward merging strategy user has
to rebase MRs to target branch before it can be merged.
Now user can do rebase in UI by clicking 'Rebase' button
instead of doing rebase locally.

This feature was already present in EE, this is only backport
of the feature to CE.

Rebase license check is now removed.

Related to !16071
Related to #40301

Revert "Add ee only comment to boards_bundle.js ee imports"

See merge request gitlab-org/gitlab-ee!3927

`Gitlab::LDAP::Person` did not respect the LDAP attributes username
configuration and would simply return the uid value. There are
cases where users would like to specify a different username field
to allow more friendly GitLab usernames. For example, it's common
in AD to have sAMAccountName be an employee ID like `A12345` while
the local part of the email address is more human-friendly.

This reverts commit de4c74f9

CE upstream - Wednesday

Closes gitaly#813, #3482, gitaly#847, and gitaly#852

See merge request gitlab-org/gitlab-ee!3906

Fix rebase status check throwing flash message

Closes #4473

See merge request gitlab-org/gitlab-ee!3922