fix(auth/service-to-service): Update to current best practices/versions (#13134)

* fix: update function to current Python

* fix: ensure service and function are uniquely named

* gen2 by default

* rename all the places

Author: glasnt

auth/service-to-service/auth_test.py

@@ -72,10 +72,11 @@ def services():
             "gcloud",
             "functions",
             "deploy",
-            f"helloworld-{suffix}",
+            f"helloworld-fn-{suffix}",
             "--project",
             project,
-            "--runtime=python38",
+            "--gen2",
+            "--runtime=python312",
             "--region=us-central1",
             "--trigger-http",
             "--no-allow-unauthenticated",
@@ -86,7 +87,7 @@ def services():
     )
 
     function_url = (
-        f"https://us-central1-{project}.cloudfunctions.net/helloworld-{suffix}"
+        f"https://us-central1-{project}.cloudfunctions.net/helloworld-fn-{suffix}"
     )
 
     token = subprocess.run(
@@ -117,7 +118,7 @@ def services():
             "gcloud",
             "functions",
             "delete",
-            f"helloworld-{suffix}",
+            f"helloworld-fn-{suffix}",
             "--project",
             project,
             "--region=us-central1",