Remove no-longer-functional flag (#3961)

`get_saved_model` doesn't actually do anything anymore, and no one 
has been missing it for some months now.
diff --git a/scripts/get_e2e_artifacts.py b/scripts/get_e2e_artifacts.py
index e62226d..2440ab7 100755
--- a/scripts/get_e2e_artifacts.py
+++ b/scripts/get_e2e_artifacts.py
@@ -162,10 +162,7 @@
 
   if FLAGS.run_test_suites:
     # Use bazel test to execute all of the test suites in parallel.
-    command = [
-        'bazel', 'test', *test_suites, '--color=yes',
-        '--test_arg=--get_saved_model'
-    ]
+    command = ['bazel', 'test', *test_suites, '--color=yes']
     print(f'Running: `{" ".join(command)}`')
     if not FLAGS.dry_run:
       subprocess.check_call(command)