chore: Add feature flag for VULN_MGMT_NO_CVES_VIEW

[dvail]

Description

A small, mostly UI update, but incremental PRs will break existing Workload CVE views' UX unless gated behind a flag.

Checklist

• Investigated and inspected CI test results
• Unit test and regression tests added
• Evaluated and added CHANGELOG entry if required
• Determined and documented upgrade steps
• Documented user facing changes (create PR based on openshift/openshift-docs and merge into rhacs-docs)

If any of these don't apply, please comment below.

Testing Performed

Manual testing that feature flag is returned via the API.

[openshift-ci]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[rhacs-bot]

Images are ready for the commit at e3f510e.

To use with deploy scripts, first export MAIN_IMAGE_TAG=4.4.x-720-ge3f510ec95.

[openshift-ci]

@dvail: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/ocp-4-12-operator-e2e-tests	e3f510e	link	false	/test ocp-4-12-operator-e2e-tests

Full PR test history. Your PR dashboard.

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