Use be_empty wherever equated with 0

Merge branch '273296-fy21q4-foundations-kr2-audit-and-update-buttons-on-projects-jobscontroller-show' into 'master'

Audit and update buttons on Projects::JobsController#show

See merge request gitlab-org/gitlab!55858

docs: Fix secret detection variable reference

See merge request gitlab-org/gitlab!55768

Fix TestCasesController permission inconsistency

See merge request gitlab-org/gitlab!55893

Add environment scope to group CI variables [RUN ALL RSPEC] [RUN AS-IF-FOSS]

See merge request gitlab-org/gitlab!55256

Remove improved_merge_diff_highlighting feature flag [RUN ALL RSPEC] [RUN AS-IF-FOSS]

See merge request gitlab-org/gitlab!55771

Remove redundant `QueryLimiting.enable_whitelist?` method

See merge request gitlab-org/gitlab!55715

Refactor Gitlab::SubscriptionPortal::Client class

See merge request gitlab-org/gitlab!55507

Our subscriptions portal (CustomersDot) is growing it's
support for GraphQL. Currently all queries are routed through
one Client class, this commit splits it into REST and Graphql
concerns accordingly to make it more manageable

Revert "Merge branch 'refactor-labkit-context-to-gitlab-application-context' into 'master'"

See merge request gitlab-org/gitlab!56166

Sync the maven metadata file upon package deletion

See merge request gitlab-org/gitlab!55207

Fixes FOSS failure on api project spec RUN AS-IF-FOSS

See merge request gitlab-org/gitlab!56150

This reverts merge request !56003

Use "Created" instead of "opened" when describing issue creation

See merge request gitlab-org/gitlab!49478

Specify the required postgres extensions

See merge request gitlab-org/gitlab!56097

Add introduced version for OpenAPI v3 spec

See merge request gitlab-org/gitlab!56063

Expose project.pushRules.rejectUnsignedCommits in gql

See merge request gitlab-org/gitlab!54113

Docs: notify users when MR is marked ready

See merge request gitlab-org/gitlab!56153

Remove gitlab_schema .graphql and .json

See merge request gitlab-org/gitlab!56057

Adds basic cross-linking and information to the table that explains
what notifications are sent and when.

Add CI_JOB_STARTED_AT and CI_PIPELINE_CREATED_AT as predefined variable

See merge request gitlab-org/gitlab!54989

Add milestone to new board new list form

See merge request gitlab-org/gitlab!55498

Makes it easier to extend for different types of list
in EE

Adds MR <> Jira association attributes to MR widget serializer

See merge request gitlab-org/gitlab!55553

api/project_spec is failing on FOSS since 'issues_templates' and
'merge_requests_templates' attributes were moved to EE

Related to https://gitlab.com/gitlab-org/gitlab/-/issues/323953

Rephrase line for clarity

See merge request gitlab-org/gitlab!56042

Update doc to include repository dropdown

See merge request gitlab-org/gitlab!53264

Reduce image sizes to 1000px on the longest side, then recompress
with pngquant just to be safe.

Use Root Image for images with missing name

See merge request gitlab-org/gitlab!54693

- source
- tests

Remove underline on invite member button focus

See merge request gitlab-org/gitlab!55906

- it is a button, should not have that.

Minor revisions to Snippets API page

See merge request gitlab-org/gitlab!56044

Fix typo in pipeline status email

See merge request gitlab-org/gitlab!55412

Restyle license compliance buttons

See merge request gitlab-org/gitlab!55667

This commit solves https://gitlab.com/gitlab-org/gitlab/-/issues/229910
The licence compliance Button on the Merge-Request Widget
has been restyled.