If an entry has been removed from the tree and later, during the same
session, a user is trying to add a new item with the same name/path we
should allow for that as long as the original entry is marked with
`deleted`.

Update window's URL after entry's re-name

Set proper hook for correct fileLanguage

Filtered out `moved` entries from the tree

- fixed test spec
- added warning only if file is deleted

Closes #50255

Closes #44838

added clear button to search input

Closes https://gitlab.com/gitlab-org/gitlab-ee/issues/4541

This also makes the IDE generally available