Reapply "Add changelog entry for S3 Express Session Auth opt-out configuration (#10106)" (#10155) (#10158)

This reverts commit a1e8d12.

Author: aemous

.changes/next-release/enhancement-s3-17094.json

@@ -0,0 +1,5 @@
+{
+  "type": "enhancement",
+  "category": "``s3``",
+  "description": "Added support for opting out of Amazon S3 Express session authentication via the new ``AWS_S3_DISABLE_EXPRESS_SESSION_AUTH`` environment variable, or the ``s3_disable_express_session_auth`` shared configuration setting."
+}