To show file and to start to go back.

This reverts commit 6ac777a7, reversing
changes made to 025cbc2a.

Remove vue from main.bundle.js file being loaded through `app/assets/javascripts/merge_request_tabs.js`

Previously the task status would be visible even if there where no tasks
in the description. This fixes that by changing the regex to check for
tasks without 0.

This also fixes a bug where update the description inline would not
update the task status text on screen.

Closes #33880

Fix https://gitlab.com/gitlab-org/gitlab-ce/issues/33868

While in a MR "Changes" tab looking at some diff note discussions.
Clicking reply and pressing the up-arrow should edit your last comment in
that discussion.

I suspect this regressed in
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/11173/diffs#f4bb984ec495c5cb58516785c62978f5209c39b4_179_178
where we changed the selector

Fix #33441

Always use a explicit true/false value to set highlight because jQuery
assumes `null` means toggle from whatever state and doesn't force false.

Regressed in
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/12098