ROX-26375: remove ability to rollback to release older than 4.3

[dashrews78]

Description

change me!

User-facing documentation

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

Testing and quality

• the change is production ready: the change is GA or otherwise the functionality is gated by a feature flag
• CI results are inspected

Automated testing

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

How I validated my change

Ran CI before changing the upgrade test to verify it failed trying to rollback to 4.1.
https://prow.ci.openshift.org/view/gs/test-platform-results/pr-logs/pull/stackrox_stackrox/12801/pull-ci-stackrox-stackrox-master-gke-upgrade-tests/1838659525264019456

[rhacs-bot]

Images are ready for the commit at c4efd0d.

To use with deploy scripts, first export MAIN_IMAGE_TAG=4.6.x-637-gc4efd0dcbe.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 48.25%. Comparing base (d20bca1) to head (c4efd0d).
Report is 71 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #12801      +/-   ##
==========================================
+ Coverage   48.23%   48.25%   +0.01%     
==========================================
  Files        2442     2442              
  Lines      175411   175485      +74     
==========================================
+ Hits        84615    84677      +62     
- Misses      83984    83996      +12     
  Partials     6812     6812              

Flag	Coverage Δ
go-unit-tests	48.25% <ø> (+0.01%)	⬆️

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[openshift-ci]

@dashrews78: 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/gke-upgrade-tests	c4efd0d	link	false	/test gke-upgrade-tests

Full PR test history. Your PR dashboard.

Details

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