Lambda policy arn (#38863)

* Fix the function_name handling logic for lambda_policy

Switch the logic handling function_names that are ARNs
so that ARNs are correctly handled and detected

* Add tests for lambda_policy function_arn

Ensure that function_arn works.

Needs a reasonable ansible_lambda_role.

test/integration/targets/lambda_policy/files/minimal_trust_policy.json

@@ -0,0 +1,12 @@
+{
+  "Version": "2012-10-17",
+  "Statement": [
+    {
+      "Effect": "Allow",
+      "Principal": {
+        "Service": "lambda.amazonaws.com"
+      },
+      "Action": "sts:AssumeRole"
+    }
+  ]
+}