enable grpc-dotnet client compression interop tests

tools/run_tests/run_interop_tests.py

@@ -207,14 +207,13 @@ class AspNetCoreLanguage:
         return {}
 
     def unimplemented_test_cases(self):
-        return _SKIP_COMPRESSION + \
-            ['compute_engine_creds']  + \
+        return ['compute_engine_creds']  + \
             ['jwt_token_creds'] + \
             _SKIP_GOOGLE_DEFAULT_CREDS + \
             _SKIP_COMPUTE_ENGINE_CHANNEL_CREDS
 
     def unimplemented_test_cases_server(self):
-        return _SKIP_COMPRESSION
+        return _SKIP_SERVER_COMPRESSION
 
     def __str__(self):
         return 'aspnetcore'