feat: [PubSub] Add SchemaViolationReason to IngestionFailureEvent (#8333)

* feat: Add SchemaViolationReason to IngestionFailureEvent
docs: Standardize spelling of "acknowledgment" in Pub/Sub protos

PiperOrigin-RevId: 761506540

Source-Link: googleapis/googleapis@c1af7f2

Source-Link: googleapis/googleapis-gen@260979c
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PubSub/metadata/V1/Pubsub.php

@@ -31,7 +31,7 @@
 
 /**
  * Establishes a stream with the server, which sends messages down to the
- * client. The client streams acknowledgements and ack deadline modifications
+ * client. The client streams acknowledgments and ack deadline modifications
  * back to the server. The server will close the stream and return the status
  * on any error. The server may close the stream with status `UNAVAILABLE` to
  * reassign server-side resources, in which case, the client should

PubSub/samples/V1/SubscriberClient/streaming_pull.php

@@ -747,7 +747,7 @@ public function seek(SeekRequest $request, array $callOptions = []): SeekRespons
 
     /**
      * Establishes a stream with the server, which sends messages down to the
-     * client. The client streams acknowledgements and ack deadline modifications
+     * client. The client streams acknowledgments and ack deadline modifications
      * back to the server. The server will close the stream and return the status
      * on any error. The server may close the stream with status `UNAVAILABLE` to
      * reassign server-side resources, in which case, the client should