Retrieve merge request closing issues from database cache

Closes #44821

See merge request gitlab-org/gitlab-ce!20911

Resolve "Increase width of left column in reports modal"

Closes #49835

See merge request gitlab-org/gitlab-ce!21048

Allow multiple JIRA transitions id split by comma or semicolon

Closes #43602

See merge request gitlab-org/gitlab-ce!20939

Hide instance statistics by default

Closes #50000

See merge request gitlab-org/gitlab-ce!21044

Making the migrations and the default do the right thing in the first
place. This makes 20180806094307 a no-op.

Add a generic more CSS class to render expandable reports correctly

See merge request gitlab-org/gitlab-ce!21014

Trigger `project_update` system hook when archiving projects

See merge request gitlab-org/gitlab-ce!20995

Moves help_popover.vue to a common location

See merge request gitlab-org/gitlab-ce!21011

Keep Admin settings sections expanded after submitting form

See merge request gitlab-org/gitlab-ce!21040

Fix initialization of JS in pipeline `/failures` tab

Closes #49994

See merge request gitlab-org/gitlab-ce!21043

Use Gitaly 0.115.0

See merge request gitlab-org/gitlab-ce!21013

Changing the default in a new migration and updating the existing
values to change the defaults for instances already exposing the statistics.

Move xterm to a node dependency and remove it from vendor's folder

Closes #49741

See merge request gitlab-org/gitlab-ce!20588

Backport changes from gitlab-ee!6740

See merge request gitlab-org/gitlab-ce!21012

Revert some unneeded code changes from environment list

See merge request gitlab-org/gitlab-ce!21026

Port of protected environments frontend changes from EE to CE

See merge request gitlab-org/gitlab-ce!21018

Add group milestones to dashboard milestone page

Closes #35748

See merge request gitlab-org/gitlab-ce!20618

Resolve "Commit messages are no longer monospace, but still white-space: pre-wrap"

Closes #47548

See merge request gitlab-org/gitlab-ce!20988

Parse junit.xml.gz and calculate the difference between head and base

See merge request gitlab-org/gitlab-ce!20576

Rails5: update Rails5 lock for forgotten gem rouge

See merge request gitlab-org/gitlab-ce!21010

System hooks were not being triggered when projects were archived or
unarchived. Reuse the Projects::UpdateService to automatically
trigger system hooks and increase code reuse.

Update proofreader.md

See merge request gitlab-org/gitlab-ce!20985