Fixes rejected pushes from maintainers

Closes #46337

See merge request gitlab-org/gitlab-ce!18968

fixed/enhanced command-line documentation

See merge request gitlab-org/gitlab-ce!19589

[Rails5] Update Gitlab.rails5.lock

See merge request gitlab-org/gitlab-ce!19681

Fix input placeholder text color

Closes #47645

See merge request gitlab-org/gitlab-ce!19633

Merge branch '47687-milestone-and-labels-dropdowns-are-misplaced-with-collapsed-sidebar' into 'master'

Resolve "Milestone and labels dropdowns are misplaced with collapsed sidebar"

Closes #47687

See merge request gitlab-org/gitlab-ce!19666

Fix: New project > Import gitlab.com project page

Closes #47357

See merge request gitlab-org/gitlab-ce!19656

Resolve "avatar settings page hr is misbehaving"

Closes #47245

See merge request gitlab-org/gitlab-ce!19667

Avatars and system icons on left of notes are shown on mobile

Closes #47604

See merge request gitlab-org/gitlab-ce!19585

Resolve "Revert MR modal box is too smal after BS4"

Closes #47522

See merge request gitlab-org/gitlab-ce!19603

Fix collapse sidebar button color

Closes #47354

See merge request gitlab-org/gitlab-ce!19662

Fix alignment of sign in/sign up button

Closes #47338

See merge request gitlab-org/gitlab-ce!19587

Update $theme-gray-600 and $gl-text-color-tertiary values according to Design System

Closes #47645

See merge request gitlab-org/gitlab-ce!19631

Fix contribution section aligment

Closes #47606

See merge request gitlab-org/gitlab-ce!19592

Resolve "Add SSH key message is hard to read"

Closes #47479 and gitlab-ee#6211

See merge request gitlab-org/gitlab-ce!19579

fix padding in commit info

Closes #47278

See merge request gitlab-org/gitlab-ce!19435

Relax expectation in spec/models/project_spec.rb

See merge request gitlab-org/gitlab-ce!19663

Multiple Sidekiq workers can run in the spec, causing `Project.find`
to be run in different places. Instead of setting a fixed number of
calls, just use `allow`.

GitHub Rake importer: Fail with a clearer explanation if GitLab username is wrong

See merge request gitlab-org/gitlab-ce!19653

Resolve "Fix color of page numbers"

Closes #46708

See merge request gitlab-org/gitlab-ce!19599

Unify from EE for app/uploaders/object_storage.rb

See merge request gitlab-org/gitlab-ce!19660

Add NOT_FOUND: 404 to http_status.js from EE

See merge request gitlab-org/gitlab-ce!19659

Expire Wiki content cache after importing a repository

Closes #47546

See merge request gitlab-org/gitlab-ce!19617

Revert extra CSS causing Gitaly Servers table to be misalgined

Closes #47648

See merge request gitlab-org/gitlab-ce!19623

[Rails5] Fix conversion of integer into string in board spec

Closes #47653

See merge request gitlab-org/gitlab-ce!19616

Before the push git would make a call to
`/:namespace/:project/git-receive-pack`. This would perform an access
check without a ref. So the `Project#branch_allows_maintainer_push?`
would return false.

This adjusts `Project#branch_allows_maintainer_push?` to return true
when passing no branch name if there are merge requests open that
would allow the user to push.

The actual check then happens when a call to
`/api/v4/internal/allowed` is made from a git hook.

The cache state for Wikis that were imported via GitHub or Bitbucket does
not appear to have been flushed after a successful import.

Closes #47546

Resolve "Uploads specs are failing on master"

Closes #47684

See merge request gitlab-org/gitlab-ce!19638