Backports of "Remove feature flag behind MR's multiple assignees"

See merge request gitlab-org/gitlab-ce!30261

Update GitLab Pages to v1.7.0

See merge request gitlab-org/gitlab-ce!30664

Use transactions in JS feature specs

Closes #60207

See merge request gitlab-org/gitlab-ce!27496

Add cleanup migration for MR's multiple assignees

See merge request gitlab-org/gitlab-ce!30269

Set the name of a user-namespace to the user name

See merge request gitlab-org/gitlab-ce!23272

[CE] Upgrade to Rails 5.2

See merge request gitlab-org/gitlab-ce!30052

change the use of boardService in favor of boardsStore on footer for the board component

See merge request gitlab-org/gitlab-ce!30616

Prevent errors when CA has no data

See merge request gitlab-org/gitlab-ce!30556

Move the gitlab-docs project under gitlab-org

See merge request gitlab-org/gitlab-ce!30620

Port EE: Fix reply to discussion on promoted epic

See merge request gitlab-org/gitlab-ce!30411

Resolve "Follow up: Simplify sort direction logic"

Closes #60798

See merge request gitlab-org/gitlab-ce!30443

Gather memory usage data during tests

See merge request gitlab-org/gitlab-ce!30292

Log memory stats after running each spec file and compile the report.

Regenerate discussion_id for notes that are being copied over to the
epic when issue is promoted to epic.

https://gitlab.com/gitlab-org/gitlab-ee/issues/11445

Resolve "API support for group-level clusters"

Closes #55623

See merge request gitlab-org/gitlab-ce!30213

Prevent excessive sanitization of AsciiDoc ouptut

Closes #63298

See merge request gitlab-org/gitlab-ce!30290

Include AuthorizeResource module for all mutations

See merge request gitlab-org/gitlab-ce!30243

Remove trailing whitespace in docs (part 1)

See merge request gitlab-org/gitlab-ce!30648

Remove unneeded trailing whitespace in lines in
/development /ci /api and /administration docs.

Add blank lines around code blocks

See merge request gitlab-org/gitlab-ce!30651

All code blocks should be surrounded by blank lines

Remove <pre> tag and other fixes

See merge request gitlab-org/gitlab-ce!30652

Reduce cyclomatic complexity of UrlBlocker.validate!

See merge request gitlab-org/gitlab-ce!30557

https://github.com/rubocop-hq/ruby-style-guide#dangerous-method-bang

Move current issue board serialization to core (CE-backport)

See merge request gitlab-org/gitlab-ce!30507

(cherry picked from commit 1e8bdd01bff96122fe80c51fa8f024f18675b58b)

Format `from` and `to` fields in JSON audit log

See merge request gitlab-org/gitlab-ce!30333

Port EE analytics route

See merge request gitlab-org/gitlab-ce!30586

Merge branch '9768-allow-a-template-in-a-namespace-which-is-out-of-the-hierarchy-of-the-group-owning-the-template-ce-doc' into 'master'

Doc for "Allow a template in a namespace which is out of the hierarchy of the Group owning the template"

See merge request gitlab-org/gitlab-ce!30601

Doc for "Allow a template in a namespace which is out of the
hierarchy of the Group owning the template"

Introduce data-qa-selector to supplant .qa-class

See merge request gitlab-org/gitlab-ce!28906

Uses Rails transactional tests instead of DatabaseCleaner
transaction strategy because that doesn't work with JS tests

Updates changed method names and fixes spec failures

Docs: Fix whitespace in administration docs

See merge request gitlab-org/gitlab-ce!30554