feat: Add support for BigQuery datasets and reservations (#33826)

* feat: Add support for BigQuery datasets and reservations
feat: Introduce resource affiliation and lineage tracking
feat: Enhance maintenance information with state, upcoming maintenance, and failure reasons

PiperOrigin-RevId: 897584246

Source-Link: googleapis/googleapis@7f9e9ff

Source-Link: googleapis/googleapis-gen@7c52c18
Copy-Tag: eyJwIjoiZ29vZ2xlLWNsb3VkLWRhdGFiYXNlX2NlbnRlci12MWJldGEvLk93bEJvdC55YW1sIiwiaCI6IjdjNTJjMThjMGFkMTY5ZTUxYzQzNmExYmZmOTcyMWIxNjJiOWMwMTUifQ==

* 🦉 Updates from OwlBot post-processor

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

---------

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

Author: gcf-owl-bot[bot]

google-cloud-database_center-v1beta/.owlbot-manifest.json

@@ -23,6 +23,7 @@
     "lib/google/cloud/database_center/v1beta/database_center/rest/service_stub.rb",
     "lib/google/cloud/database_center/v1beta/rest.rb",
     "lib/google/cloud/database_center/v1beta/version.rb",
+    "lib/google/cloud/databasecenter/v1beta/affiliation_pb.rb",
     "lib/google/cloud/databasecenter/v1beta/machine_config_pb.rb",
     "lib/google/cloud/databasecenter/v1beta/maintenance_pb.rb",
     "lib/google/cloud/databasecenter/v1beta/metric_data_pb.rb",
@@ -37,6 +38,7 @@
     "proto_docs/google/api/field_behavior.rb",
     "proto_docs/google/api/launch_stage.rb",
     "proto_docs/google/api/resource.rb",
+    "proto_docs/google/cloud/databasecenter/v1beta/affiliation.rb",
     "proto_docs/google/cloud/databasecenter/v1beta/machine_config.rb",
     "proto_docs/google/cloud/databasecenter/v1beta/maintenance.rb",
     "proto_docs/google/cloud/databasecenter/v1beta/metric_data.rb",