docs(downgrade): clarifies metadata version support for downgrades

[PaulRMellor]

Documentation

Updates downgrade section to clarify that cluster metadata downgrade is not supported in a version if it has metadata changes

Checklist

Please go through this checklist and make sure all applicable tasks have been done

• Write tests
• Make sure all tests pass
• Update documentation
• Check RBAC rights for Kubernetes / OpenShift roles
• Try your changes from Pod inside your Kubernetes and OpenShift cluster, not just locally
• Reference relevant issue(s) and close them after merging
• Update CHANGELOG.md
• Supply screenshots for visual changes, such as Grafana dashboards

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 67.50%. Comparing base (b769941) to head (d014f99).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #11885      +/-   ##
============================================
- Coverage     67.51%   67.50%   -0.02%     
+ Complexity     7084     7082       -2     
============================================
  Files           574      574              
  Lines         28143    28143              
  Branches       3189     3189              
============================================
- Hits          19002    18999       -3     
- Misses         7825     7826       +1     
- Partials       1316     1318       +2     

see 2 files with indirect coverage changes

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[scholzj]

Thanks Paul.

[mimaison]

LGTM