## What this PR does
Reduces flakiness in E2E tests by addressing the most common failure
modes.
### Kubernetes tenant tests (`run-kubernetes.sh`)
- Increase node Ready timeout from 2m to 5m — CI runners are shared and
resource-constrained
- Fail fast when nodes are not Ready — saves ~7 minutes per failed
attempt by not running LB/NFS tests that will also fail
- Delete stale Kubernetes resources at test start — retries provision
from scratch instead of patching stuck state
- Wait for port-forward to be ready before using it (fixes race
condition)
- Reduce version check polling interval from 5s to 1s
### All app tests (postgres, redis, kafka, clickhouse, mariadb, mongodb,
qdrant, foundationdb, openbao, vminstance, bucket)
- Add pre-cleanup of stale resources from previous failed retries so
each attempt starts clean
### Test runner (`cozytest.sh`)
- Clean up temp directory on test failure (was only cleaned on success,
leaking `/tmp` dirs)
### Release note
```release-note
NONE
```
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **Tests**
* Improved e2e robustness by deleting stale resources before creation
(ignore-if-missing, bounded time) and killing leftover port-forwards.
* Added an exit cleanup to consistently remove temporary artifacts and
teardown port-forwards on any exit.
* Added readiness polling for forwarded endpoints (curl with timeout);
made API/version retries more responsive.
* Extended node readiness wait (2m → 5m), dump debug info and fail fast
if unready.
* Made load‑balancer reachability checking explicit and more reliable.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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