Call QuickActionsService on Note update

Add support for notes which just contain
commands after editing

Return http status gone (410) if note was deleted

Temporary frontend addition so it is not
failing when a note is deleted

Move specs to shared examples

Fix rubocop style issue

Deleting note on frontend when status is 410

Use guard clause for note which got deleted

Simplified condition for nil note

This method should no longer be called
with nil note

Refactoring of execute method to reduce
complexity

Move errors update to delete_note method

Note is now deleted visually when it only
contains commands after update

Add expectation

Fix style issues

Changing action to fix tests

Add tests for removeNote and update
deleteNote expectations

Send a `persist_filter: false` param to backend when
opening links to notes and auto-switching to show
all notes

- Adds color and a tooltip to describe this new behavior
- Does not resolve if discussion is already resolved
- Adds an action `resolveDiscussion` to simplify `toggleResolveNote`
- Updates docs

https://gitlab.com/gitlab-org/gitlab-ce/issues/54405

When converting a comment to a discussion
if the "Cancel" button is used to exit the new discussion note,
the comment would revert back to its initial state

Sets `updated_at` so that the transformed note is returned together with
the new reply

Improve the renderign of new and existing discussions
by reducing the number of watchers on each object & array.
Previously every discussion change would trigger an update for every
discussion component.

Also tidied up some components to get them closer to our docs.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/51506

Instead of relying on a global method, we now emit an event on the MR
widget that tells it to check the status

After resolving a discussion on a merge request page the merge request
widget state would not get updated meaning users would need to refresh
the page to merge (if that option is enabled in the projects settings)

https://gitlab.com/gitlab-org/gitlab-ce/issues/42882

added spec for polling

Add loading button for better UX

Formats dates
Fixes clipboard button
Simplifies HTML