[Multiple isssue assignees] feature is far behind of the master by this commit I resolve the BE part

Merge branch 'master' of gitlab.com:gitlab-org/gitlab-ee into multiple_assignees_review_upstream[ci skip]

Fix spinach test

See merge request !1780

Fix bug that was causing bulk issue assignment to fail

See merge request !1783

Fix board milestone spec

See merge request !1782

Re-enable ref operations with gitaly after not-found fix

See merge request !1758

[EE] Enable `RSpec/DescribedClass` cop and correct violations

See merge request !1721

Port of "Reject more reserved paths" to EE

See merge request !1778

Fix issue spec

See merge request !1776

Fix Geo geo:set_primary_node task not working with HTTPS

See merge request !1774

Fix time tracking tests

See merge request !1775

implements new logic for push mirrors to update on push

See merge request !1616

And validate if new paths need to be added.

This is a port to EE of https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/10413 to EE

Fix bug where checkmark would not show up on selected user dropdown

See merge request !1771

Add a note about pipeline quota reset on the first of each month

See merge request !1772

Fix bug inside the board_sidebar component

See merge request !1773

The Rake task to set the current node as primary in Geo did not account for HTTPS.

Add multiple assignees to create issue page

See merge request !1766

Port of 12910-personal-snippets-notes-show into EE

See merge request !1768

[EE] Resolve "rspec_profiling is enabled for MySQL"

See merge request !1756