feat: [Eventarc] usage deprecation of credentials client option (#8595)

* feat: add new fields to Eventarc resources
docs: correct some comments

PiperOrigin-RevId: 807339306

Source-Link: googleapis/googleapis@dfce92d

Source-Link: googleapis/googleapis-gen@3c3884e
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* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

* feat: support ClientOptions in client constructor
docs: document universeDomain client option
docs: add "generic" phpdocs for OperationResponse and ServerStream
fix: Update pagination rules for compute clients
deps: Update dependency google/protobuf to v4

PiperOrigin-RevId: 807444648

Source-Link: googleapis/googleapis@6288882

Source-Link: googleapis/googleapis-gen@577eee9
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* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

* docs: usage deprecation of credentials client option

PiperOrigin-RevId: 809097824

Source-Link: googleapis/googleapis@e8ed6b4

Source-Link: googleapis/googleapis-gen@96cfee1
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---------

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Author: gcf-owl-bot[bot]

Eventarc/metadata/V1/Channel.php

@@ -37,15 +37,15 @@
  *                                              {@see EventarcClient::locationName()} for help formatting this field.
  * @param string $enrollmentCelMatch            A CEL expression identifying which messages this enrollment
  *                                              applies to.
- * @param string $formattedEnrollmentMessageBus Resource name of the message bus identifying the source of the
- *                                              messages. It matches the form
+ * @param string $formattedEnrollmentMessageBus Immutable. Resource name of the message bus identifying the
+ *                                              source of the messages. It matches the form
  *                                              projects/{project}/locations/{location}/messageBuses/{messageBus}. Please see
  *                                              {@see EventarcClient::messageBusName()} for help formatting this field.
  * @param string $enrollmentDestination         Destination is the Pipeline that the Enrollment is delivering to.
  *                                              It must point to the full resource name of a Pipeline. Format:
  *                                              "projects/{PROJECT_ID}/locations/{region}/pipelines/{PIPELINE_ID)"
  * @param string $enrollmentId                  The user-provided ID to be assigned to the Enrollment. It should
- *                                              match the format (^[a-z]([a-z0-9-]{0,61}[a-z0-9])?$).
+ *                                              match the format `^[a-z]([a-z0-9-]{0,61}[a-z0-9])?$`.
  */
 function create_enrollment_sample(
     string $formattedParent,

Eventarc/metadata/V1/ChannelConnection.php

@@ -41,7 +41,7 @@
  *                                                    "projects/{PROJECT_ID}/locations/{region}/messagesBuses/{MESSAGE_BUS_ID)
  *                                                    Please see {@see EventarcClient::messageBusName()} for help formatting this field.
  * @param string $googleApiSourceId                   The user-provided ID to be assigned to the GoogleApiSource. It
- *                                                    should match the format (^[a-z]([a-z0-9-]{0,61}[a-z0-9])?$).
+ *                                                    should match the format `^[a-z]([a-z0-9-]{0,61}[a-z0-9])?$`.
  */
 function create_google_api_source_sample(
     string $formattedParent,

Eventarc/metadata/V1/Enrollment.php

@@ -36,7 +36,7 @@
  * @param string $formattedParent The parent collection in which to add this message bus. Please see
  *                                {@see EventarcClient::locationName()} for help formatting this field.
  * @param string $messageBusId    The user-provided ID to be assigned to the MessageBus. It should
- *                                match the format (^[a-z]([a-z0-9-]{0,61}[a-z0-9])?$)
+ *                                match the format `^[a-z]([a-z0-9-]{0,61}[a-z0-9])?$`.
  */
 function create_message_bus_sample(string $formattedParent, string $messageBusId): void
 {

Eventarc/metadata/V1/GoogleChannelConfig.php

@@ -36,7 +36,8 @@
  *
  * @param string $formattedParent The parent collection in which to add this pipeline. Please see
  *                                {@see EventarcClient::locationName()} for help formatting this field.
- * @param string $pipelineId      The user-provided ID to be assigned to the Pipeline.
+ * @param string $pipelineId      The user-provided ID to be assigned to the Pipeline. It should
+ *                                match the format `^[a-z]([a-z0-9-]{0,61}[a-z0-9])?$`.
  */
 function create_pipeline_sample(string $formattedParent, string $pipelineId): void
 {