performance-metrics: Apply vm_type override in run()

Apply the vm_type override from PerformanceTestOverrides to the
effective_control used during test execution, alongside the
existing test_timeout override.

Signed-off-by: Muminul Islam <muislam@microsoft.com>

performance-metrics/src/main.rs

@@ -294,6 +294,7 @@ impl PerformanceTest {
             if let Some(test_timeout) = overrides.test_timeout {
                 control.test_timeout = test_timeout;
             }
+            control.vm_type = overrides.vm_type;
             control
         };