fix(test): resolve flaky test

We are not entirely sure what the cause of the flakyness is, however by improving the assertions to be more specific to what this test is supposed to fix we expect that the flakyness is resolved.

(cherry picked from commit 3ca46f0)

engine/src/test/java/io/camunda/zeebe/engine/processing/timer/TimerStartEventTest.java

@@ -356,27 +356,25 @@ public void shouldTriggerAndCreateProcessInstance() {
         .hasVersion(deployedProcess.getVersion())
         .hasProcessDefinitionKey(processDefinitionKey);
 
-    final long triggerRecordPosition =
-        RecordingExporter.timerRecords(TimerIntent.TRIGGER)
+    final var processInstanceKey =
+        RecordingExporter.processInstanceRecords(ProcessInstanceIntent.ELEMENT_ACTIVATED)
             .withProcessDefinitionKey(processDefinitionKey)
             .getFirst()
-            .getPosition();
+            .getValue()
+            .getProcessInstanceKey();
 
     assertThat(
-            RecordingExporter.timerRecords()
-                .withProcessDefinitionKey(processDefinitionKey)
-                .skipUntil(r -> r.getPosition() >= triggerRecordPosition)
-                .limit(2))
-        .extracting(Record::getIntent)
-        .containsExactly(TimerIntent.TRIGGER, TimerIntent.TRIGGERED);
+            RecordingExporter.timerRecords(TimerIntent.TRIGGERED)
+                .withProcessInstanceKey(processInstanceKey)
+                .exists())
+        .isTrue();
 
     assertThat(
             RecordingExporter.processInstanceRecords()
                 .withProcessDefinitionKey(processDefinitionKey)
-                .skipUntil(r -> r.getPosition() >= triggerRecordPosition)
-                .limit(4))
+                .limitToProcessInstanceCompleted())
         .extracting(r -> r.getValue().getBpmnElementType(), Record::getIntent)
-        .containsExactly(
+        .containsSequence(
             tuple(BpmnElementType.PROCESS, ProcessInstanceIntent.ACTIVATE_ELEMENT),
             tuple(BpmnElementType.PROCESS, ProcessInstanceIntent.ELEMENT_ACTIVATING),
             tuple(BpmnElementType.PROCESS, ProcessInstanceIntent.ELEMENT_ACTIVATED),