Tolerate win line endings on windows module_util load (#37291)

* tolerate windows line endings when loading windows module utils.  Helpful for old custom windows modules.

* add test modules to demonstrate win line ending module load behaviour.

* attempt to fix sanity check failures

* pep8 fix

* explict skip of test modules from shebang check (core modules must still have expected unix style line endings)

* switch to rstrip() following core team meeting feedback

test/integration/targets/win_module_utils/library/legacy_only_new_way_win_line_ending.ps1

@@ -0,0 +1,6 @@
+#!powershell
+
+#Requires -Module Ansible.ModuleUtils.Legacy
+
+Exit-Json @{ data="success" }
+

test/integration/targets/win_module_utils/library/legacy_only_old_way_win_line_ending.ps1

@@ -0,0 +1,4 @@
+#!powershell
+# POWERSHELL_COMMON
+
+Exit-Json @{ data="success" }

test/integration/targets/win_module_utils/tasks/main.yml

@@ -14,6 +14,22 @@
     that:
     - new_way.data == 'success'
 
+- name: call old WANTS_JSON module with windows line endings
+  legacy_only_old_way_win_line_ending:
+  register: old_way_win
+
+- assert:
+    that:
+    - old_way_win.data == 'success'
+
+- name: call module with only legacy requires and windows line endings
+  legacy_only_new_way_win_line_ending:
+  register: new_way_win
+
+- assert:
+    that:
+    - new_way_win.data == 'success'
+
 - name: call module with local module_utils
   uses_local_utils:
   register: local_utils