chore(all): auto-regenerate .pb.go files

This is an auto-generated regeneration of the .pb.go files by
cloud.google.com/go/internal/gapicgen. Once this PR is submitted, genbot will
update the corresponding PR to depend on the newer version of go-genproto, and
assign reviewers. Whilst this or any regen PR is open in go-genproto, genbot
will not create any more regeneration PRs. If all regen PRs are closed,
gapicgen will create a new set of regeneration PRs once per night.

If you have been assigned to review this PR, please:

- Ensure that CI is passing. If it's failing, it requires your manual attention.
- Approve and submit this PR if you believe it's ready to ship. That will prompt
genbot to assign reviewers to the google-cloud-go PR.

Corresponding google-cloud-go PR: googleapis/google-cloud-go#6245

Changes:

feat(analytics/admin): Enable REST transport for most of Java and Go clients
  PiperOrigin-RevId: 456641589
  Source-Link: googleapis/googleapis@8a251f5

chore: regenerate API index

  Source-Link: googleapis/googleapis@49de8b0

feat(aiplatform): add BatchImportModelEvaluationSlices API in aiplatform v1 model_service.proto
  PiperOrigin-RevId: 456604066
  Source-Link: googleapis/googleapis@d57f437

chore: regenerate API index

  Source-Link: googleapis/googleapis@f3b7f03

feat: add client library BUILD rules, API proto option, v1alpha service config file and service YAML file
  PiperOrigin-RevId: 456598021
  Source-Link: googleapis/googleapis@bf12acd

feat(aiplatform): add model_version_id to BatchPredictionJob in aiplatform v1 batch_prediction_job.proto
  feat: add model_version_id to DeployedModel in aiplatform v1 endpoint.proto

  feat: add model_version_id to PredictResponse in aiplatform v1 prediction_service.proto
  PiperOrigin-RevId: 456571762
  Source-Link: googleapis/googleapis@19bd392

chore: regenerate API index

  Source-Link: googleapis/googleapis@fb1c7ff

feat(aiplatform): add BatchImportModelEvaluationSlices API in aiplatform v1beta1 model_service.proto
  PiperOrigin-RevId: 456559576
  Source-Link: googleapis/googleapis@f5cd509

chore: regenerate API index

  Source-Link: googleapis/googleapis@dc5611c

feat: add BeyondCorp appconnections API
  PiperOrigin-RevId: 456539168
  Source-Link: googleapis/googleapis@557d78e

chore: regenerate API index

  Source-Link: googleapis/googleapis@426d87e

feat: add BeyondCorp clientconnectorservices API
  PiperOrigin-RevId: 456538455
  Source-Link: googleapis/googleapis@bbd13d3

chore: regenerate API index

  Source-Link: googleapis/googleapis@c63fb2b

feat: add BeyondCorp appgateways API
  PiperOrigin-RevId: 456537802
  Source-Link: googleapis/googleapis@e0e822c

chore: regenerate API index

  Source-Link: googleapis/googleapis@df910c6

feat: add BeyondCorp clientgateways API
  PiperOrigin-RevId: 456537186
  Source-Link: googleapis/googleapis@584bde6

chore: regenerate API index

  Source-Link: googleapis/googleapis@7eebdfc

feat: add BeyondCorp appconnectors API
  PiperOrigin-RevId: 456537133
  Source-Link: googleapis/googleapis@c018a50