docs: update release pipelines beta status (#6199)

Author: matthewelwell

docs/docs/advanced-use/release-pipelines.md

@@ -1,8 +1,10 @@
 # Release Pipelines
 
-:::warning
+:::info
+
+Release Pipelines is currently in a closed beta, please contact us if you'd like to gain access.
 
-Release Pipelines is currenlty in alpha phase and is not available to the public.
+<a class="open-chat button button--primary" data-crisp-chat-message="Hello, I'm interested in joining the Release Pipelines beta.">Contact Us</a>
 
 :::