Enable more pylint rules and fix reported issues. (#30539)

* Enable pylint unreachable test.
* Enable pylint suppressed-message test.
* Enable pylint redundant-unittest-assert test.
* Enable pylint bad-open-mode test.
* Enable pylint signature-differs test.
* Enable pylint unnecessary-pass test.
* Enable pylint unnecessary-lambda test.
* Enable pylint raising-bad-type test.
* Enable pylint logging-not-lazy test.
* Enable pylint logging-format-interpolation test.
* Enable pylint useless-else-on-loop test.

lib/ansible/module_utils/basic.py

@@ -729,8 +729,7 @@ def env_fallback(*args, **kwargs):
     for arg in args:
         if arg in os.environ:
             return os.environ[arg]
-    else:
-        raise AnsibleFallbackNotFound
+    raise AnsibleFallbackNotFound
 
 
 def _lenient_lowercase(lst):