- Show if user can_resolve all of the notes

New API endpoint for merge request count
Updates all open tabs at the same time with one call
Restructured API response

API response changed to 401 if no current_user

Added API + JS specs

Fix for Static Check

Updated Count on Open/Close, Assign/Unassign of MR's

Checking if MR Count is refreshed

Added # frozen_string_literal: true to spec

Added Changelog

- all commits squashed to make danger review happy

Add test for checking output

Revert useless timeout added in karma spec

- Moved discussion notes out of `NoteableDiscussion` component into a
new `DiscussionNotes` component
- Wrote Jest tests for the new `DiscussionNotes` component
- Updated Jest config for emojis fixtures
- Updated Karma tests `NoteableDiscussion` to match its new structure
- Convert `DiffDiscussions` tests to use Vue test utils

Also removes specs related to the flag

Upgrade to latest Version

Adds discussion note style section under notes app from where
user can toggle discussion when they have selected a filter to show
only system notes.

Backports template and Vue changes from https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/9632 to CE

Move convertToDiscussion call from ReplyButton to NoteApp component

(cherry picked from commit 861f93e6)