Skip terraform tests if no go files were changed in the downstream (#5026) (#3476)

* Skip terraform tests if no go files were changed in the downstream

* Switched to checking the diff locally instead of making a separate API request

Signed-off-by: Modular Magician <[email protected]>

Author: modular-magician

.changelog/5026.txt

@@ -0,0 +1,3 @@
+```release-note:none
+
+```

google-beta/resource_dataproc_cluster_test.go

@@ -13,9 +13,8 @@ import (
 	"github.com/hashicorp/terraform-plugin-sdk/v2/helper/resource"
 	"github.com/hashicorp/terraform-plugin-sdk/v2/terraform"
 
-	"google.golang.org/api/googleapi"
-
 	dataproc "google.golang.org/api/dataproc/v1beta2"
+	"google.golang.org/api/googleapi"
 )
 
 func TestDataprocExtractInitTimeout(t *testing.T) {