test(alerts): rename ack test to reflect state is unchanged

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

cameleer-server-app/src/test/java/com/cameleer/server/app/alerting/storage/PostgresAlertInstanceRepositoryIT.java

@@ -164,7 +164,7 @@ class PostgresAlertInstanceRepositoryIT extends AbstractPostgresIT {
     }
 
     @Test
-    void ack_setsAckedAtAndState() {
+    void ack_setsAckedAtAndLeavesStateFiring() {
         var inst = newInstance(ruleId, List.of(userId), List.of(), List.of());
         repo.save(inst);