Move S3PostUploadSignedPolicy outside of _bcl folder (#3900)

* move to non bcl folder

* Add dev config

* remove bcl

* update text

* update text

* Update c2e4913e-b19a-4bca-b372-322bffb0662b.json

* update attribute

* Add comments to code

* add optimization

Author: GarrettBeatty

generator/.DevConfigs/c2e4913e-b19a-4bca-b372-322bffb0662b.json

@@ -0,0 +1,11 @@
+{
+  "services": [
+    {
+      "serviceName": "S3",
+      "type": "patch",
+      "changeLogMessages": [
+        "Move S3PostUploadSignedPolicy out of _bcl folder"
+      ]
+    }
+  ]
+}