Lift probe head cap + add hard timeout

The setUp-aware probe hung past 800 trace lines (truncated by `head
-800`) so we couldn't see the failing query. Bump head to 2500 and
add a timeout so a hung probe doesn't block the rest of the job.

Author: JanJakes

.github/workflows/phpunit-tests-turso.yml

@@ -2024,7 +2024,10 @@ jobs:
         working-directory: packages/mysql-on-sqlite
         run: |
           set +e
-          php <<'PHP' 2>&1 | head -800
+          # Add a hard timeout so a hung probe step doesn't block the
+          # whole job; head -2500 keeps log size reasonable.
+          timeout --kill-after=5 60 \
+            php <<'PHP' 2>&1 | head -2500
           <?php
           // Boot the driver, run failing test scenarios. With RUST_LOG
           // including translate=trace, Turso prints each prepared SQL