feat: [Firestore] expose the 'auto_commit_transaction' option for the ExecutePipeline API (#9244)

* feat: expose the 'auto_commit_transaction' option for the ExecutePipeline API
feat: expose the 'concurrency_mode' option for the Cloud Firestore API
chore: Firestore.executePipeline to not retry on `DEADLINE_EXCEEDED`
docs: A comment for message `TransactionOptions` is changed to better detail the new 'concurrency_mode' option.
docs: A comment for field `parent` in message `.google.firestore.v1.ListCollectionIdsRequest` is changed to describe how to list top-level collections.
docs: A comment for field `order_by` in message `.google.firestore.v1.StructuredQuery` is updated to describe default behavior for ENTERPRISE edition databases

PiperOrigin-RevId: 929318392

Source-Link: googleapis/googleapis@465f309

Source-Link: googleapis/googleapis-gen@3b64fbe
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Firestore/metadata/V1/Common.php

@@ -35,6 +35,9 @@
  *                       `projects/{project_id}/databases/{database_id}/documents/{document_path}`.
  *                       For example:
  *                       `projects/my-project/databases/my-database/documents/chatrooms/my-chatroom`
+ *
+ *                       Use `projects/{project_id}/databases/{database_id}/documents` to list
+ *                       top-level collections.
  */
 function list_collection_ids_sample(string $parent): void
 {