feat(backupdr): add InitializeServiceAPI (#11419)

- [ ] Regenerate this pull request now.

feat(backupdr): Update field behavior of `networks` field in message `ManagementServer` to `OPTIONAL`
feat(backupdr): add enum to Backup Vault Access Restriction field
feat(backupdr): `ignore_backup_plan_references` added to the DeleteBackupVaultRequest
fix(backupdr)!: Update field behavior of `resource_type` field in message `BackupPlanAssociation` to `REQUIRED`
docs(backupdr): A comment for field `networks` in message `.google.cloud.backupdr.v1.ManagementServer` is changed
docs(backupdr): A comment for field `requested_cancellation` in message `.google.cloud.backupdr.v1.OperationMetadata` is changed
docs(backupdr): A comment for field `resource_type` in message `.google.cloud.backupdr.v1.BackupPlan` is changed
docs(backupdr): A comment for field `backup_retention_days` in message `.google.cloud.backupdr.v1.BackupRule` is changed
docs(backupdr): A comment for field `resource_type` in message `.google.cloud.backupdr.v1.BackupPlanAssociation` is changed
docs(backupdr): A comment for field `data_source` in message `.google.cloud.backupdr.v1.BackupPlanAssociation` is changed
docs(backupdr): A comment for field `rule_id` in message `.google.cloud.backupdr.v1.RuleConfigInfo` is changed
docs(backupdr): A comment for field `last_backup_error` in message `.google.cloud.backupdr.v1.RuleConfigInfo` is changed
docs(backupdr): A comment for enum value `ACCESS_RESTRICTION_UNSPECIFIED` in enum `AccessRestriction` is changed
docs(backupdr): A comment for field `uid` in message `.google.cloud.backupdr.v1.BackupVault` is changed
docs(backupdr): A comment for field `access_restriction` in message `.google.cloud.backupdr.v1.BackupVault` is changed

PiperOrigin-RevId: 713528070

Source-Link: https://togithub.com/googleapis/googleapis/commit/8cd87061e43b6adf3f7d0b1d40d0f6192cc2ca74

Source-Link: https://togithub.com/googleapis/googleapis-gen/commit/a5c65facebe8d5523ade60fa5506bc8c35dad868
Copy-Tag: eyJwIjoiLmdpdGh1Yi8uT3dsQm90LnlhbWwiLCJoIjoiYTVjNjVmYWNlYmU4ZDU1MjNhZGU2MGZhNTUwNmJjOGMzNWRhZDg2OCJ9
BEGIN_NESTED_COMMIT
docs(recaptchaenterprise): tweak comments
PiperOrigin-RevId: 713415280

Source-Link: https://togithub.com/googleapis/googleapis/commit/c76e13d561f3cc34349b1b1498c5815350883083

Source-Link: https://togithub.com/googleapis/googleapis-gen/commit/0735bf9c21e07b103b867494145fa7cc7e52719e
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END_NESTED_COMMIT
BEGIN_NESTED_COMMIT
docs(gkemulticloud): fix comments of existing field
PiperOrigin-RevId: 713414570

Source-Link: https://togithub.com/googleapis/googleapis/commit/ba1a1c7a863a59e2c3ce6d95eb25d1c546320446

Source-Link: https://togithub.com/googleapis/googleapis-gen/commit/5757850b48320202f8f8bfef54ba3915317b9e18
Copy-Tag: eyJwIjoiLmdpdGh1Yi8uT3dsQm90LnlhbWwiLCJoIjoiNTc1Nzg1MGI0ODMyMDIwMmY4ZjhiZmVmNTRiYTM5MTUzMTdiOWUxOCJ9
END_NESTED_COMMIT
BEGIN_NESTED_COMMIT
feat(cloudbuild/apiv1): Add GoModule to Artifact and Results messages and new GO_MODULE_H1 hash type
PiperOrigin-RevId: 713355615

Source-Link: https://togithub.com/googleapis/googleapis/commit/16db8020109a5fb90130261bd1b923e69f675154

Source-Link: https://togithub.com/googleapis/googleapis-gen/commit/998323131456ec0eae5131ee673a964cac69708b
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END_NESTED_COMMIT