test: re-enable batch & emulator integration tests (googleapis#2878)

Change-Id: I415531d6b34b7d21391f0f4bd0dad65ff97bfd56

Co-authored-by: Mattie Fu <mattiefu@google.com>

Author: igorbernstein2

.kokoro/presubmit/integration.cfg

@@ -8,7 +8,7 @@ env_vars: {
 
 env_vars: {
     key: "INTEGRATION_TEST_ARGS"
-    value: "-P bigtable-prod-it,enable-verbose-grpc-logs -Dbigtable.project=gcloud-devel -Dbigtable.instance=google-cloud-bigtable -Dbigtable.table=integration-tests -Dbigtable.kms_key_name=projects/gcloud-devel/locations/us-east1/keyRings/cmek-test-key-ring/cryptoKeys/cmek-test-key -Dbigtable.wait-for-cmek-key-status=true"
+    value: "-P bigtable-emulator-it,bigtable-prod-it,bigtable-prod-batch-it,enable-verbose-grpc-logs -Dbigtable.project=gcloud-devel -Dbigtable.instance=google-cloud-bigtable -Dbigtable.table=integration-tests -Dbigtable.kms_key_name=projects/gcloud-devel/locations/us-east1/keyRings/cmek-test-key-ring/cryptoKeys/cmek-test-key -Dbigtable.wait-for-cmek-key-status=true"
 }
 
 env_vars: {