Update CODEOWNERS to include tooling approvers for additional directories

Author: Johan Broberg

.github/CODEOWNERS

@@ -2,4 +2,8 @@
 * @microsoft/agent365-approvers
 /.github/ @microsoft/agent365-approvers
 /libraries/microsoft-agents-a365-observability-*/ @microsoft/agent365-observability-approvers
-/tests/observability/ @microsoft/agent365-observability-approvers
+/tests/observability/ @microsoft/agent365-observability-approvers
+/libraries/microsoft-agents-a365-notifications/ @microsoft/agent365-tooling-approvers
+/libraries/microsoft-agents-a365-tooling*/ @microsoft/agent365-tooling-approvers
+/tests/notifications/ @microsoft/agent365-tooling-approvers
+/tests/tooling/ @microsoft/agent365-tooling-approvers