fix(test/pvtime): bump tolerance to 10s

We found a single failure for which the steal time between snapshot
and restore went slightly above 2s on an AMD instance.
As the purpose of this check is to ensure the value is "sane" (iow not
a completely random number), not that it's really accurate (that's a
kernel problem), I'm bumping it to 10s.

Signed-off-by: Riccardo Mancini <mancio@amazon.com>

Author: Manciukic

tests/integration_tests/functional/test_steal_time.py

@@ -110,7 +110,7 @@ def test_pvtime_snapshot(uvm_plain, microvm_factory):
     steal_after_resume = get_steal_time_ms(restored_vm)
 
     # Ensure steal time persisted and continued increasing
-    tolerance = 2000  # 2.0 seconds tolerance for persistence check
+    tolerance = 10000  # 10.0 seconds tolerance for persistence check
     persisted = (
         steal_before < steal_after_snap and steal_after_snap - steal_before < tolerance
     )