flaky: TestArchivalBlobSync in nodebuilder/tests

## Flaky test

**Test:** `TestArchivalBlobSync`
**Package:** `github.com/celestiaorg/celestia-node/nodebuilder/tests`
**PR:** #4956
**CI run:** https://github.com/celestiaorg/celestia-node/actions/runs/24693631027/job/72222790850

### Error
```
prune_test.go:154:
Error Trace: /home/runner/work/celestia-node/celestia-node/nodebuilder/tests/prune_test.go:154
Error: Should be false
Test: TestArchivalBlobSync
...
network.go:78: tearing down testnode
network.go:119: error when closing API server close tcp 127.0.0.1:45623: use of closed network connection
FAIL github.com/celestiaorg/celestia-node/nodebuilder/tests 30.103s
```

### Notes
This test failure appears to be a flake — #4956 only changes GitHub Actions workflow YAML files and cannot affect Go integration tests. The assertion at `prune_test.go:154` fails many times in the same run, and the test was previously observed failing on an unrelated PR (#4949). Retrying CI produced the same failure.