ROX-32012: Clean up remains of upstream OLM

[porridge]

Description

• Lower timeout for OLM prep, now that we are not installing is anymore.
• Remove olm-{un,}install targets and go.mod entry, and add notes on OLM-GKE trouble

User-facing documentation

• CHANGELOG.md 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

• not modified existing tests

How I validated my change

CI should be enough

[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

[porridge]

/test all

[sourcery-ai]

Hey - I've left some high level feedback:

• The note about upstream OLM not working on GKE is now duplicated in the README; consider consolidating it into a single clearly visible section to avoid future divergence.
• Since olm-install/olm-uninstall targets and the OLM go-tool were removed, double-check for any remaining references to these targets or the OLM binary in other Makefiles or CI scripts to prevent broken workflows.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- The note about upstream OLM not working on GKE is now duplicated in the README; consider consolidating it into a single clearly visible section to avoid future divergence.
- Since `olm-install`/`olm-uninstall` targets and the OLM go-tool were removed, double-check for any remaining references to these targets or the OLM binary in other Makefiles or CI scripts to prevent broken workflows.

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[rhacs-bot]

Images are ready for the commit at eec47a8.

To use with deploy scripts, first export MAIN_IMAGE_TAG=4.11.x-68-geec47a8393.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 49.48%. Comparing base (773e872) to head (eec47a8).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #18938      +/-   ##
==========================================
- Coverage   49.48%   49.48%   -0.01%     
==========================================
  Files        2661     2661              
  Lines      200782   200782              
==========================================
- Hits        99350    99348       -2     
- Misses      94015    94017       +2     
  Partials     7417     7417              

Flag	Coverage Δ
go-unit-tests	49.48% <ø> (-0.01%)	⬇️

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[rhacs-bot]

/retest