Fix awx-collection tests for ansible-core 2.21.0 compat
ansible-core 2.21.0 introduced _PARSED_MODULE_ARGS in
module_utils/basic.py, used by _return_formatted() to conditionally
include invocation data. The awx_collection test harness bypasses
normal arg parsing via _load_params mock, leaving this variable as
None and causing AttributeError on every exit_json/fail_json call.
Mock _PARSED_MODULE_ARGS with _ansible_inject_invocation=True to
match the pre-2.21 behavior of always including invocation data.