🚨 Cherry-pick Conflicts: [VIRT] add descheduler test to validate psi values on nodes (PR #2086)

[github-actions]

⚠️ Cherry-pick Conflicts - Manual Resolution Required

The automatic cherry-pick of PR #2086 from dshchedr/openshift-virtualization-tests resulted in conflicts.

Original PR: [VIRT] add descheduler test to validate psi values on nodes
Author: @dshchedr
Merge Commit: 4a53659

🔧 How to resolve:

1. Check out this branch locally: git fetch origin && git checkout cherry-pick-pr-2086-17822124836-conflicts
2. Resolve conflicts in the affected files
3. Test your changes thoroughly
4. Commit your resolution: git add . && git commit
5. Push changes: git push origin cherry-pick-pr-2086-17822124836-conflicts
6. Mark this PR as ready for review

📁 Files with conflicts:

tests/virt/node/descheduler/test_descheduler_psi_metrics.py 

Original PR Link: #2086
Original Commit: 4a53659

Original PR Description

add descheduler test to validate psi values within the threshold on nodes

Short description:

More details:

What this PR does / why we need it:

Which issue(s) this PR fixes:

Special notes for reviewer:

jira-ticket:

Summary by CodeRabbit

• Tests
  • Added automated checks to ensure node pressure/PSI metrics stay within acceptable thresholds during descheduler rebalancing.
  • Introduced a shared validation utility to verify PSI thresholds across instances, improving reliability and clarity of failures.
  • Enhances test coverage for load-aware behavior with descriptive assertions to speed up triage.
  • No changes to runtime behavior or user-facing functionality.

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[openshift-virtualization-qe-bot]

D/S test tox -e verify-bugs-are-open failed: cnv-tests-tox-executor/16880