Speed up unit tests with synctest and optimized retry delays

[nammn]

Summary

Why

• Unit tests were slow due to actual time.Sleep() calls and HTTP retry delays, causing unnecessary wait times during test execution.
• Using Synctest to speed up slow unit tests (which were relying on sleeps and go scheduler scheduling)
• test changed and speedup:

What

• Adopted Go testing/synctest to eliminate real-time waits in time-based tests (PVC resize, StatefulSet deletion)
• Configured HTTP clients in tests to retry immediately instead of waiting seconds between attempts
• Fixed CI to only create Python venv for Python tests, not Go tests

Test	Before	After
TestReconcilePVCResizeShardedCluster	3.06s	0.03s
TestReconcilePVCResizeMultiCluster	3.06s	0.05s
TestHandlePVCResize	1.00s	0.00s
TestIsMemberClusterHealthy	3.00s	0.00s
TestRetriesOnWritingAutomationConfig	3.00s	0.05s

Proof of Work

• passing unit tests

Checklist

• Have you linked a jira ticket and/or is the ticket in the title?
• Have you checked whether your jira ticket required DOCSP changes?
• Have you added changelog file?
  • use skip-changelog label if not needed
  • refer to Changelog files and Release Notes section in CONTRIBUTING.md for more details

[nammn]

returning retries makes testing easier

[github-actions]

⚠️ (this preview might not be accurate if the PR is not rebased on current master branch)

MCK 1.6.2 Release Notes

Bug Fixes

• Fixed an issue where monitoring agents would fail after disabling TLS on a MongoDB deployment.
• Persistent Volume Claim resize fix: Fixed an issue where the Operator ignored namespaces when listing PVCs, causing conflicts with resizing PVCs of the same name. Now, PVCs are filtered by both name and namespace for accurate resizing.

[nammn]

noop, just wrapping synctest