repair communication livetests (Azure#34842)

Author: scbedd

sdk/communication/tests.yml

@@ -20,7 +20,6 @@ parameters:
 extends:
     template: /eng/pipelines/templates/stages/archetype-sdk-tests.yml
     parameters:
-      JobName: ${{ replace(service, '-', '_') }}
       # All 5 service stages run in parallel, and with no parallel limits the tests may get throttled.
       MaxParallel: 2
       ServiceDirectory: communication