Add aws_s3 action plugin to find source files as expected (#35028)

People expect to be able to upload files to s3 using standard
locations for files.

Providing an action plugin that effectively rewrites the `src`
key to the result of finding such a file is a great help.

Tests added, and IAM permissions corrected

hacking/aws_config/testing_policies/storage-policy.json

@@ -15,8 +15,8 @@
             ],
             "Effect": "Allow",
             "Resource": [
-                "arn:aws:s3:::ansible_test_*",
-                "arn:aws:s3:::ansible_test_*/*"
+                "arn:aws:s3:::ansible-test-*",
+                "arn:aws:s3:::ansible-test-*/*"
             ]
         }
     ]