if users are None/empty, dont assume sameness (#58875)

(cherry picked from commit 4ef2545)

 also fix all cases of none remote/become users (#59397)
 some cases failed, when defaults were None on the plugins

(cherry picked from commit 74ac229)

changelogs/fragments/become_none.yml

@@ -0,0 +1,2 @@
+bugfixes:
+    - Do not assume None is equal as connection and become tools can have different unspecified defaults.

lib/ansible/plugins/action/__init__.py

@@ -1035,9 +1035,11 @@ def _low_level_execute_command(self, cmd, sudoable=True, in_data=None, executabl
             display.debug("_low_level_execute_command(): changing cwd to %s for this command" % chdir)
             cmd = self._connection._shell.append_command('cd %s' % chdir, cmd)
 
-        if (sudoable and self._connection.transport != 'network_cli' and self._connection.become and
-                (C.BECOME_ALLOW_SAME_USER or
-                 self.get_become_option('become_user') != self._get_remote_user())):
+        ruser = self._get_remote_user()
+        buser = self.get_become_option('become_user')
+        if (sudoable and self._connection.become and  # if sudoable and have become
+                self._connection.transport != 'network_cli' and  # if not using network_cli
+                (C.BECOME_ALLOW_SAME_USER or (buser != ruser or not any((ruser, buser))))):  # if we allow same user PE or users are different and either is set
             display.debug("_low_level_execute_command(): using become for this command")
             cmd = self._connection.become.build_become_command(cmd, self._connection._shell)