Fix concurrency issue with migration for user_interacted_projects table.

Closes #44205

See merge request gitlab-org/gitlab-ce!17728

Add HTML style guide

See merge request gitlab-org/gitlab-ce!17616

Add frontend guide principles

See merge request gitlab-org/gitlab-ce!17613

Update README.md

See merge request gitlab-org/gitlab-ce!17344

Prevent sending an access request from failing when the project has invited masters/owners

See merge request gitlab-org/gitlab-ce!17760

Fix moving local, unhashed upload or pages directories during group transfer

Closes #43993

See merge request gitlab-org/gitlab-ce!17658

Add me as proofreader

See merge request gitlab-org/gitlab-ce!17593

add Indonesian proofreader

See merge request gitlab-org/gitlab-ce!17579

Prettier Phase 1: Prettier Configuration, Prettifying of files and documentation

See merge request gitlab-org/gitlab-ce!17695

Change path of CI lints create index.js file

Closes #44181

See merge request gitlab-org/gitlab-ce!17751

Update net-ssh 4.1.0 -> 4.2.0 (Fixes #21734)

Closes #21734

See merge request gitlab-org/gitlab-ce!17688

Update ruby-saml to 1.7.2 and omniauth-saml to 1.10.0 (CVE-2017-11428, CVE-2017-11430)

Closes #43806

See merge request gitlab-org/gitlab-ce!17734

update fog-aws 1.4 -> 2.0

See merge request gitlab-org/gitlab-ce!17708

Update acts-as-taggable-on to 5.0

See merge request gitlab-org/gitlab-ce!17689

Update sentry-raven 2.5.3 -> 2.7 (Fixes #24029)

Closes #24029

See merge request gitlab-org/gitlab-ce!17709

Update octokit 4.6.2 -> 4.8

See merge request gitlab-org/gitlab-ce!17738

Update ruby-prof 0.16.2 -> 0.17.0

See merge request gitlab-org/gitlab-ce!17710

The concurrency issue originates from inserts on
`user_interacted_projects` from the app while running the post-deploy
migration.

This change comes with a strategy to lock the table while removing
duplicates and creating the unique index (and similar for FK
constraints).

Also, we'll have a non-unique index until the post-deploy migration is
finished to speed up queries during that time.

Closes #44205.

When the route action is create it defaults to new, this saves us having multiple files for the same route

Closes #44181

Update httparty 0.13.3 -> 0.15.6

See merge request gitlab-org/gitlab-ce!17737

Import multiple issue assignees from GitLab export

Closes #40275

See merge request gitlab-org/gitlab-ce!17718

Breadcrumb on Admin Runner page

Closes #43717

See merge request gitlab-org/gitlab-ce!17431

When importing from a GitLab archive, an admin can carry over the
assignations. Other users can not.

When a regular user is importing an issue with multiple assignees, the
assignee is replaced with the current user, meaning we would try to
insert current user as an assignee multiple times.

By filtering the array before storing it, the import becomes more
robust.

Update foreman to 0.84.0

Closes #44160

See merge request gitlab-org/gitlab-ce!17690

Docs: Incoming e-mails: require gitlab-ctl restart

See merge request gitlab-org/gitlab-ce!17587

Fix styling of multiple environments in merge request widget

Closes #40610

See merge request gitlab-org/gitlab-ce!17663

Move CreateRepository to OPT_OUT for Gitaly

See merge request gitlab-org/gitlab-ce!17740

Replace project graphs spinach tests with RSpec analog

See merge request gitlab-org/gitlab-ce!17675

Replace project redirects spinach tests with RSpec analog

See merge request gitlab-org/gitlab-ce!17676

Hide emoji popup after multiple spaces or blank lines, closes #40620,#33678

Closes #40620 and #33678

See merge request gitlab-org/gitlab-ce!17680

Improve tests for predefined variables

See merge request gitlab-org/gitlab-ce!17597

On .com repositories are created through Gitaly for a while now. For
customers this is not the case unless these have chosen to do so through
feature flags. By moving this to opt out, everyone will be using this.

This move is part of the migration issue
https://gitlab.com/gitlab-org/gitaly/issues/593

The bigger impact this commit will have is that tests that use a
repository through `FactoryBot.create(:project, :repository)` will now
use Gitaly to do so. As tests run on the same disk, or at least machine,
this will most probably slow them down.

removed pointless test & changed some deployment tests to make more sense
added in v-tooltip