MDL-81523 upgrade: Add a upgrade note sharing about the change/fix

.upgradenotes/MDL-81523-2024052812372416.yml

@@ -0,0 +1,14 @@
+issueNumber: MDL-81523
+notes:
+  core:
+    - message: >
+        All the setup and tear down methods of `PHPUnit` now are required to,
+        always, call to their parent counterparts. This is a good practice to
+        avoid future problems, especially when updating to PHPUnit >= 10.
+
+        This includes the following methods:
+          - `setUp()`
+          - `tearDown()`
+          - `setUpBeforeClass()`
+          - `tearDownAfterClass()`
+      type: fixed