chore: move managed udf tests to large tests (#1503)

* chore: move managed udf tests to large tests

Right now we need to actively cleanup the managed BQ functions
b/403599621, so we are moving away from creating persistent managed functions.

* dedup managed function tests after we moved small to large

Author: shobsi

noxfile.py

@@ -469,10 +469,6 @@ def cover(session):
         "--show-missing",
         "--include=tests/unit/*",
         "--include=tests/system/small/*",
-        # TODO(b/401609005): remove this omission once either the small udf
-        # tests are made to run in system tests or they are moved to large
-        # system tests (aka e2e tests)
-        "--omit=tests/system/small/functions/test_managed_function.py",
         # TODO(b/353775058) resume coverage to 100 when the issue is fixed.
         "--fail-under=99",
     )