Clear memoized manifest to solve intermittent spec errors

Closes #255176

See merge request gitlab-org/gitlab!43229

Provide canUpdate to boards

See merge request gitlab-org/gitlab!43028

Move created issues in the activity column

See merge request gitlab-org/gitlab!43016

`spec/lib/gitlab/webpack/manifest_spec.rb` appears to be failing
intermittently due to a memoized manifest that is loaded before the
tests are run. We now clear these values between each run to ensure a
clean state.

Closes https://gitlab.com/gitlab-org/gitlab/-/issues/255176

Docs: Update metadata with Testing group

See merge request gitlab-org/gitlab!43165

Add gl-button class to the snippets haml views

See merge request gitlab-org/gitlab!43181

Documentation about LFS authentication on import

See merge request gitlab-org/gitlab!43049

Add a note about the precedence of the `.lfsconfig` authentication data
on Project import.

Add approved meta to MR Analytics Throughput table

See merge request gitlab-org/gitlab!42216

Add the approvals meta to the MR analytics
throughput data table.

Correct typo in /ci/secrets documentation

See merge request gitlab-org/gitlab!43219

Replaced HashiCoupr with HashiCorp in
"Using external secrets in CI"

Fixed typo in README.md

See merge request gitlab-org/gitlab!43183

Restore string used in multiple places

Closes #254940

See merge request gitlab-org/gitlab!43193

Add CI_JOB_STATUS predefined variable to documentation

Closes #16579

See merge request gitlab-org/gitlab!41999

Add section to docs about multiple registries

See merge request gitlab-org/gitlab!43033

Remove old coverage feature flags

See merge request gitlab-org/gitlab!43163

Add additional detail to vuln export section

See merge request gitlab-org/gitlab!43127

Add info about pipelines_security_report_summary FF

See merge request gitlab-org/gitlab!43166

Update config/feature_flags/development/not_issuable_queries.yml

See merge request gitlab-org/gitlab!43169

Fixed typo in permissions.md

See merge request gitlab-org/gitlab!43182

While I don't care for how this string is set up, it's used in
multiple places in the document and I shouldn't have taken it out.

Updated capitalization for to dos

See merge request gitlab-org/gitlab!43029

Remove ES cache feature flags

See merge request gitlab-org/gitlab!42962

Add Info About Feature Flag Permissions Flag

See merge request gitlab-org/gitlab!43134

Development on this has been halted for some time now, but this flag is
still around. I'm not sure if it is worth deleting all the code or not,
as we still have plans to develop the feature.

Revert justified-content-end in admin, group, & project settings

Closes #246783

See merge request gitlab-org/gitlab!42273

Migrate to GlTabs for Feature Flags Page

See merge request gitlab-org/gitlab!42371

This uses the tabs from GitLab UI!

Quarantine stale create_merge_request_spec

See merge request gitlab-org/gitlab!43161

Prevent assignment of groups using quick actions

See merge request gitlab-org/gitlab!42810

Move the partial success condition out of the success transition

See merge request gitlab-org/gitlab!42768