ROX-25354: Feature flags `README.md` update

[parametalol]

Description

Added a few use cases.

User-facing documentation

• [x] CHANGELOG is updated OR update is not needed
• [x] documentation PR is created and is linked above OR is not needed

Testing

• [ ] inspected CI results

Automated testing

• [ ] added unit tests
• [ ] added e2e tests
• [ ] added regression tests
• [ ] added compatibility tests
• [ ] modified existing tests

How I validated my change

Peer review.

[openshift-ci[bot]]

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 ee1864a.

To use with deploy scripts, first export MAIN_IMAGE_TAG=4.6.x-207-gee1864ad8a.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 48.20%. Comparing base (d8016b3) to head (580861c).

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #12226      +/-   ##
==========================================
- Coverage   48.20%   48.20%   -0.01%     
==========================================
  Files        2403     2403              
  Lines      171644   171644              
==========================================
- Hits        82743    82737       -6     
- Misses      82221    82225       +4     
- Partials     6680     6682       +2     

Flag	Coverage Δ
go-unit-tests	48.20% <ø> (-0.01%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

[openshift-ci[bot]]

@0x656b694d: The following tests 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/gke-ui-e2e-tests	4e5883c9b5c91238317c7fbf71bd3b5105748b14	link	false	/test gke-ui-e2e-tests
ci/prow/gke-scanner-v4-tests	4e5883c9b5c91238317c7fbf71bd3b5105748b14	link	false	/test gke-scanner-v4-tests
ci/prow/ocp-4-12-scanner-v4-tests	4e5883c9b5c91238317c7fbf71bd3b5105748b14	link	false	/test ocp-4-12-scanner-v4-tests
ci/prow/ocp-4-12-ui-e2e-tests	4e5883c9b5c91238317c7fbf71bd3b5105748b14	link	false	/test ocp-4-12-ui-e2e-tests
ci/prow/ocp-4-16-ui-e2e-tests	4e5883c9b5c91238317c7fbf71bd3b5105748b14	link	false	/test ocp-4-16-ui-e2e-tests
ci/prow/ocp-4-16-scanner-v4-tests	4e5883c9b5c91238317c7fbf71bd3b5105748b14	link	false	/test ocp-4-16-scanner-v4-tests
ci/prow/ocp-4-12-qa-e2e-tests	ee1864ad8a903fed2689310a89c273a543343c65	link	false	/test ocp-4-12-qa-e2e-tests

Full PR test history. Your PR dashboard.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository. I understand the commands that are listed here.