lint(test,core): remove misplaced test code and fix undefined names

- Import subprocess where used to fix F821 in cli/setup/applications
- Remove accidental test methods from RoleDependencyResolver implementation
- Remove invalid and non-discoverable test functions from test_role_dependency_resolver
- Eliminate test code that was never executed due to wrong scope/indentation
- Restore clear separation between production code and unit tests

https://chatgpt.com/share/6942c3ec-8a10-800f-9a15-c319f5e93089

cli/setup/applications.py

@@ -2,6 +2,7 @@
 import argparse
 import yaml
 import sys
+import subprocess
 from pathlib import Path
 from module_utils.dict_renderer import DictRenderer
 from lookup_plugins.application_gid import LookupModule