Add stress testing for quota-lock and refactor test guard usage

.github/workflows/rust.yml

@@ -45,6 +45,18 @@ jobs:
     - name: Run tests
       run: cargo test --verbose
 
+    - name: Stress quota-lock suites (PR only)
+      if: github.event_name == 'pull_request'
+      env:
+        RUST_TEST_THREADS: 16
+      run: |
+        set -euo pipefail
+        for i in $(seq 1 12); do
+          echo "[quota-lock-stress] iteration ${i}/12"
+          cargo test quota_lock_ --bin telemt -- --nocapture --test-threads 16
+          cargo test relay_quota_wake --bin telemt -- --nocapture --test-threads 16
+        done
+
 # clippy dont fail on warnings because of active development of telemt 
 # and many warnings
     - name: Run clippy