Add high-level docs for Instance and Docker Autoscaler executors

See merge request https://gitlab.com/gitlab-org/gitlab-runner/-/merge_requests/3953



Merged-by: Jon Glassman <jglassman@gitlab.com>
Approved-by: Fiona Neill <fneill@gitlab.com>
Approved-by: Jon Glassman <jglassman@gitlab.com>
Approved-by: Georgi N. Georgiev <ggeorgiev@gitlab.com>
Reviewed-by: Tomasz Maczukin <tomasz@maczukin.pl>
Reviewed-by: Fiona Neill <fneill@gitlab.com>
Co-authored-by: Fiona Neill <fneill@gitlab.com>
Co-authored-by: Darren Eastman <deastman@gitlab.com>
Co-authored-by: Arran Walker <ajwalker@gitlab.com>

CTRT edits Kubernetes part 4

See merge request https://gitlab.com/gitlab-org/gitlab-runner/-/merge_requests/3963



Merged-by: Diana Logan <dlogan@gitlab.com>
Approved-by: Diana Logan <dlogan@gitlab.com>
Reviewed-by: Diana Logan <dlogan@gitlab.com>
Co-authored-by: fneill <fneill@gitlab.com>

Add Config Validation section to runner Docs

See merge request https://gitlab.com/gitlab-org/gitlab-runner/-/merge_requests/4017



Merged-by: Fiona Neill <fneill@gitlab.com>
Approved-by: Joe Burnett <jburnett@gitlab.com>
Approved-by: Fiona Neill <fneill@gitlab.com>
Reviewed-by: Joe Burnett <jburnett@gitlab.com>
Reviewed-by: Davis Bickford <dbickford@gitlab.com>
Co-authored-by: Davis Bickford <dbickford@gitlab.com>
Co-authored-by: Darren Eastman <deastman@gitlab.com>

Try all specified TCP ports when doing a service container health-check

Closes #29130

See merge request https://gitlab.com/gitlab-org/gitlab-runner/-/merge_requests/4010



Merged-by: Arran Walker <ajwalker@gitlab.com>
Approved-by: Arran Walker <ajwalker@gitlab.com>
Reviewed-by: Tomasz Maczukin <tomasz@maczukin.pl>
Co-authored-by: Axel von Bertoldi <avonbertoldi@gitlab.com>

Add fine grained configuration of autoscaler histograms

See merge request https://gitlab.com/gitlab-org/gitlab-runner/-/merge_requests/4014



Merged-by: Davis Bickford <dbickford@gitlab.com>
Approved-by: Davis Bickford <dbickford@gitlab.com>
Reviewed-by: Tomasz Maczukin <tomasz@maczukin.pl>
Reviewed-by: Davis Bickford <dbickford@gitlab.com>
Co-authored-by: Tomasz Maczukin <tomasz@maczukin.pl>

Use a fixed time in register command integration tests

See merge request https://gitlab.com/gitlab-org/gitlab-runner/-/merge_requests/4023



Merged-by: Arran Walker <ajwalker@gitlab.com>
Approved-by: Axel von Bertoldi <avonbertoldi@gitlab.com>

The existing tests would occasionally break if the start and end
of the test didn't have to the second precision.

Update index.md to remove typo in the second paragraph

See merge request https://gitlab.com/gitlab-org/gitlab-runner/-/merge_requests/4013



Merged-by: Fiona Neill <fneill@gitlab.com>
Approved-by: Fiona Neill <fneill@gitlab.com>
Co-authored-by: vsvincent <vincentvs01@yahoo.com>

Update version in docs

See merge request https://gitlab.com/gitlab-org/gitlab-runner/-/merge_requests/4022



Merged-by: Fiona Neill <fneill@gitlab.com>
Approved-by: Fiona Neill <fneill@gitlab.com>
Co-authored-by: Filip Aleksic <faleksic@gitlab.com>

Reduce config validation message noise

See merge request https://gitlab.com/gitlab-org/gitlab-runner/-/merge_requests/4016



Merged-by: Joe Burnett <jburnett@gitlab.com>
Approved-by: Tomasz Maczukin <tomasz@maczukin.pl>

Fix flaky racy tests

See merge request https://gitlab.com/gitlab-org/gitlab-runner/-/merge_requests/4019



Merged-by: Arran Walker <ajwalker@gitlab.com>
Approved-by: Axel von Bertoldi <avonbertoldi@gitlab.com>

TestDockerCommandUsingCustomClonePath and TestDockerCommandMultistepBuild are at
least affected by this, but probably more.

Add note about runner registration permission

See merge request https://gitlab.com/gitlab-org/gitlab-runner/-/merge_requests/4021



Merged-by: Fiona Neill <fneill@gitlab.com>
Approved-by: Fiona Neill <fneill@gitlab.com>
Co-authored-by: Alejandro Guerrero <argdealba@gitlab.com>

Handle build's parent context cancelation correctly

See merge request https://gitlab.com/gitlab-org/gitlab-runner/-/merge_requests/4018



Merged-by: Arran Walker <ajwalker@gitlab.com>
Approved-by: Tomasz Maczukin <tomasz@maczukin.pl>

Fix flaky TestDockerPrivilegedServiceAccessingBuildsFolder

See merge request https://gitlab.com/gitlab-org/gitlab-runner/-/merge_requests/4012



Merged-by: Arran Walker <ajwalker@gitlab.com>
Approved-by: Tomasz Maczukin <tomasz@maczukin.pl>

Refactor executor setup/executor name function

Closes #30846

See merge request https://gitlab.com/gitlab-org/gitlab-runner/-/merge_requests/3982



Merged-by: Georgi N. Georgiev <ggeorgiev@gitlab.com>
Approved-by: Georgi N. Georgiev <ggeorgiev@gitlab.com>
Co-authored-by: Arran Walker <ajwalker@gitlab.com>