Merge 10-6-stable-frozen into 10-6-stable

See merge request gitlab-org/gitlab-ce!17644

# Conflicts:
#	locale/gitlab.pot

Fix index name to Rails default to ensure idempotency

See merge request gitlab-org/gitlab-ce!17654

Add index on section_name_id on ci_build_trace_sections table

Closes #44008

See merge request gitlab-org/gitlab-ce!17632

Adding missing indexes migrations from taggings table

Closes #43927

See merge request gitlab-org/gitlab-ce!17563

Create CI/CD-only projects from GitHub -- CE backport

See merge request gitlab-org/gitlab-ce!17432
# Conflicts:
#	locale/gitlab.pot

Fix Error 500 when updating a project

Closes #44019

See merge request gitlab-org/gitlab-ce!17647

Fix Error 500 when updating a project

Closes #44019

See merge request gitlab-org/gitlab-ce!17647

# Conflicts:
#	GITLAB_PAGES_VERSION

Backport changes from introducing GithubService interation in EE

See merge request gitlab-org/gitlab-ce!17607

Don't delete todos or unassign issues and MRs when a user leaves a project

Closes #43899

See merge request gitlab-org/gitlab-ce!17615

Port changes from EE: https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/4885 (Maintainer push to fork)

See merge request gitlab-org/gitlab-ce!17629

Removes confusing/unnecessary checkboxes when trying to configure an
integration. If there is only one supported event we don't need to
allow these to be individually disabled since the integration can be
disabled instead.

E.g. Project Integrations for GitHub, Bugzilla, Asana, Pipeline emails and Gemnasium

Allows integrations to override which triggers are configurable

backport of custom metrics for the common metrics section of CE

See merge request gitlab-org/gitlab-ce!17586

Update project activity when pushing to a wiki repository

See merge request gitlab-org/gitlab-ce!17621

Create CI/CD-only projects from GitHub -- CE backport

See merge request gitlab-org/gitlab-ce!17432

Fix accessibility typo

See merge request gitlab-org/gitlab-ce!17612

Backport relevant changes from EE https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/4827 to CE

See merge request gitlab-org/gitlab-ce!17608

Move SidebarAssignees vue component

See merge request gitlab-org/gitlab-ce!17398

Resolve "Add a mention and link to doc for security implications in the Kubernetes cluster page"

Closes #43780 and #43781

See merge request gitlab-org/gitlab-ce!17486

# Conflicts:
#   locale/gitlab.pot

Add new frontend guide structure

See merge request gitlab-org/gitlab-ce!17611

Allow maintainers to push forks of a project for branches that have open MRs

Closes #22292

See merge request gitlab-org/gitlab-ce!17395

Update GitLab Pages to v0.7.0

See merge request gitlab-org/gitlab-ce!17603

Resolve "Make margin around dropdown dividers 4px"

Closes #39444

See merge request gitlab-org/gitlab-ce!17517

Reduce number of FindCommit calls from RefsController#logs_tree

Closes gitaly#1057

See merge request gitlab-org/gitlab-ce!17566

Fixes attempts to update a service integration which had `can_test?`
set to true but validations were causing the "Test and save changes"
button to return "Something went wrong on our end."

Removes references to index action left from 0af99433