This makes us to use a memoized Flipper engine
that simply always works.

We also change a implementation of `persisted_names`
to use a `Flipper` instead of requesting features
manually.

By default a memoized engine is used, which
can be overwritten with `stub_feature_flags: false`.

The memoized engine requires us to use object that
are `FeatureGate-inherited`. We ensure
that this holds true, always.

This MR also updates all tests to adhere to this requirement.

[ci skip]

[ci skip]

Add polling for vulnerability comments and state

See merge request gitlab-org/gitlab!30420

Remove search icon from Project find file button

Closes #25830

See merge request gitlab-org/gitlab!33198

Persist resolution alert dismissal

See merge request gitlab-org/gitlab!31739

Bump cluster-applications to 0.17.0

See merge request gitlab-org/gitlab!32931

Added producing of new emoji map which will be loaded async in the future

See merge request gitlab-org/gitlab!33292

Allow user to apply or turn swimlanes on within boards

See merge request gitlab-org/gitlab!32739

Expose test reports on GraphQL

See merge request gitlab-org/gitlab!32599

Add mutation to create a commit in GraphQL

See merge request gitlab-org/gitlab!31102

Add NuGet metadata and dependency links to package presenter

See merge request gitlab-org/gitlab!33060

Network policy management editor

See merge request gitlab-org/gitlab!32032

Add state events to burnup chart data

See merge request gitlab-org/gitlab!33048

Prevent diff spans from overgrowing the container

Closes #218471

See merge request gitlab-org/gitlab!32774

Alert Management|Details page: update some styles and attributes

See merge request gitlab-org/gitlab!32785

* adds spec
* updates existing one

Reorder diffs compare versions dropdowns

Closes #32230

See merge request gitlab-org/gitlab!31770

Remove order clauses from the limited counter helper

See merge request gitlab-org/gitlab!33187

Move jquery.endless-scroll import away from main

See merge request gitlab-org/gitlab!33267

Upgrade Gitaly to v13.1.0-rc1

See merge request gitlab-org/gitlab!33302

Update dependency @sourcegraph/code-host-integration to v0.0.48

See merge request gitlab-org/gitlab!33284

Update GitLab UI/SVG

See merge request gitlab-org/gitlab!33273

Docs: List orphans in artifact admin troubleshooting

See merge request gitlab-org/gitlab!32756

Introduced feature flag :boards_with_swimlanes

Change SpamVerdictService GET to POST

See merge request gitlab-org/gitlab!33129

fix exist typo.

See merge request gitlab-org/gitlab!33361

Fix "Close Issue" button by changing target selector

Closes #219323

See merge request gitlab-org/gitlab!33294

Add index in issues on last_edited_by_id

Closes #218036

See merge request gitlab-org/gitlab!33075

Fix schema file

Document how to control tool versions in license_scanning

See merge request gitlab-org/gitlab!33236

* Document different ASDF_ variables
* Add notes on how to interact with the license_scanning Docker image
* Add note on JAVA 8 and Gradle 1.x support

Onboarding experiment new group step

See merge request gitlab-org/gitlab!31952

Move U2F frontend code into shared authentication folder

See merge request gitlab-org/gitlab!33208