[ML] Increase Timeout for Nightly Build (Azure#26541)

* Increase Timeout for Nightly Build

* Update tests.yml

* reduce timeout after verifying how long tests take

Co-authored-by: Neehar Duvvuri <[email protected]>

Author: needuv

sdk/ml/tests.yml

@@ -7,6 +7,7 @@ stages:
       ServiceDirectory: ml
       MatrixReplace:
         - TestSamples=.*/true
+      TestTimeoutInMinutes: 270
       CloudConfig:
         Public:
           SubscriptionConfiguration: $(python-ml-subscription-scope-configuration)