[aws_s3] Fix uploading src option on the target machine to a bucket (#39023)

* Fix backward compatibility for uploading src option on the target machine to a bucket

* Allow the module to handle errors for nonexistent files

lib/ansible/plugins/action/aws_s3.py

@@ -20,7 +20,7 @@ __metaclass__ = type
 
 import os
 
-from ansible.errors import AnsibleError, AnsibleAction, AnsibleActionFail
+from ansible.errors import AnsibleError, AnsibleAction, AnsibleActionFail, AnsibleFileNotFound
 from ansible.module_utils._text import to_text
 from ansible.plugins.action import ActionBase
 
@@ -43,9 +43,15 @@ class ActionModule(ActionBase):
             new_module_args = self._task.args.copy()
             if source:
                 source = os.path.expanduser(source)
+
+                # For backward compatibility check if the file exists on the remote; it should take precedence
+                if not self._remote_file_exists(source):
                     try:
                         source = self._loader.get_real_file(self._find_needle('files', source))
                         new_module_args['src'] = source
+                    except AnsibleFileNotFound as e:
+                        # module handles error message for nonexistent files
+                        new_module_args['src'] = source
                     except AnsibleError as e:
                         raise AnsibleActionFail(to_text(e))