This change is a fairly straightforward refactor to extract the tracing
and correlation-id code from the gitlab rails codebase into the new
LabKit-Ruby project.

The corresponding import into LabKit-Ruby was in
https://gitlab.com/gitlab-org/labkit-ruby/merge_requests/1

The code itself remains very similar for now.

Extracting it allows us to reuse it in other projects, such as
Gitaly-Ruby. This will give us the advantages of correlation-ids and
distributed tracing in that project too.

Always save artifacts in the gitlab:ui:visual job

See merge request gitlab-org/gitlab-ce!27469

Retry twice the review-qa-smoke job

See merge request gitlab-org/gitlab-ce!27470

Add missing props to monitoring bundles

See merge request gitlab-org/gitlab-ee!11037

make the monitoring bundle reusable

See merge request gitlab-org/gitlab-ce!27402

Merge branch '60500-disable-jit-kubernetes-resource-creation-for-project-level-clusters' into 'master'

Disable JIT Kubernetes resource creation for project level clusters

Closes #60500

See merge request gitlab-org/gitlab-ce!27352

Bump version of knative from 0.3 -> 0.5

See merge request gitlab-org/gitlab-ce!27101

Bump version of knative from 0.3 -> 0.5

See merge request gitlab-org/gitlab-ee!10662

Retry twice the system, API and unknown failures

See merge request gitlab-org/gitlab-ce!27467

Signed-off-by: Rémy Coutable <remy@rymai.me>

Signed-off-by: Rémy Coutable <remy@rymai.me>

Resolve "Default bar colours for Insights"

Closes #11186

See merge request gitlab-org/gitlab-ee!11076

Replace `No due date` with `None`

See merge request gitlab-org/gitlab-ce!27437

Better document the current states of our testing levels

See merge request gitlab-org/gitlab-ce!27431

Update README.md

See merge request gitlab-org/gitlab-ce!27426

Update JIRA service API doc

See merge request gitlab-org/gitlab-ce!26435

Add Masked Variables to Variables documentation

See merge request gitlab-org/gitlab-ce!27236

Merge branch '9726-usage-ping-for-epics_deepest_relationship_level-should-not-be-1-for-most-non-eeu-cases' into 'master'

Return nil for epics_deepest_relationship_level when there are no Epics

Closes #9726

See merge request gitlab-org/gitlab-ee!10756

Only show author in autocomplete dropdown if author is active

See merge request gitlab-org/gitlab-ce!27292

Signed-off-by: Rémy Coutable <remy@rymai.me>

Put four flaky specs in quanrantine

See merge request gitlab-org/gitlab-ce!27456

#57815 Omniauth UltraAuth strategy

See merge request gitlab-org/gitlab-ce!26348

Signed-off-by: Rémy Coutable <remy@rymai.me>