chore: Add 25.3.0 release notes partial

Author: NickLarsenNZ

modules/ROOT/partials/release-notes/release-25.3.adoc

@@ -0,0 +1,52 @@
+// Here are the headings you can use for the next release. Saves time checking indentation levels.
+// Take a look at release 24.11 to see how to structure patch releases.
+
+== Release 25.3
+
+=== 25.3.0
+
+Released on 2025-03-21.
+
+==== New platform features
+
+==== Platform improvements
+
+==== Platform deprecations
+
+==== Product versions
+
+===== New versions
+
+===== Deprecated versions
+
+===== Removed versions
+
+==== stackablectl
+
+==== Supported Kubernetes versions
+
+==== Supported OpenShift versions
+
+==== Breaking changes
+
+Of the changes mentioned above, the following are breaking (or could lead to breaking behaviour), and you will need to adapt your existing CRDs accordingly:
+
+===== Stackable Operator for Example Product
+
+* Description of the change 1
+* Description of the change 2
+
+.Breaking changes details
+[%collapsible]
+====
+* `spec.a`: This field has been removed.
+* `spec.b`: This field has been changed to a number.
+====
+
+==== Upgrade from 24.11
+
+===== Using stackablectl
+
+===== Using Helm
+
+==== Known issues