(doc) Add blog post for Agent 2.2.0

Author: corbob

src/content/docs/en-us/agent/release-notes.mdx

@@ -37,6 +37,8 @@ This covers the release notes for the Chocolatey Agent Service (`chocolatey-agen
 
 ## 2.2.0 (December 4, 2024) \{#v2.2.0}
 
+Read our [blog post](https://blog.chocolatey.org/2024/12/announcing-agent-220-release) about this release.
+
 ### Feature
 
 - Implement Background Job Management System.