feat: add `GetDisplayVideo360AdvertiserLink`, `ListDisplayVideo360AdvertiserLinks`, `CreateDisplayVideo360AdvertiserLink`, `DeleteDisplayVideo360AdvertiserLink` methods to the API
feat: add `GetDisplayVideo360AdvertiserLinkProposal`, `ListDisplayVideo360AdvertiserLinkProposals`,`DeleteDisplayVideo360AdvertiserLinkProposal`, `CancelDisplayVideo360AdvertiserLinkProposal` methods to the API
feat: add `LinkProposalStatusDetails`, `DisplayVideo360AdvertiserLinkProposal`, `DisplayVideo360AdvertiserLink`
`LinkProposalState`, `LinkProposalInitiatingProduct`, `ServiceLevel`, `DataRetentionSettings` types to the API
feat: add `service_level` field to `Property` type
feat: add `display_video_360_advertiser_link`, `display_video_360_advertiser_link_proposal`, `data_retention_settings` fields to `ChangeHistoryChange.resource` oneof field.
feat: add `custom` output only field to `ConversionEvent` type
feat: change `measurement_unit` field to mutable in `CustomMetric` type
fix!: remove `UpdateFirebaseLink` method from the API
fix!: rename `is_deletable` field of `ConversionEvent` type to `deletable`
fix!: rename `email_address` field of `GoogleAdsLink` type to `creator_email_address`
fix!: remove `maximum_user_access` field from `FirebaseLink` type
fix!: remove `MaximumUserAccess` enum from the API
PiperOrigin-RevId: 392540180