Update change fragment of 300

Author: ItsDrike

changes/300.internal.md

@@ -1,3 +1,4 @@
 - Fix CI not running unit tests on python 3.8 (only 3.11)
 - Update to use python 3.12 (in validation and as one of the matrix versions in unit-tests workflow)
 - Trigger and run lint and unit-tests workflows form a single main CI workflow.
+- Only send status embed after the main CI workflow finishes (not for both unit-tests and validation)