chore(all): auto-regenerate .pb.go files (googleapis#688)

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#4904

Changes:

chore: regenerate API index

  Source-Link: googleapis/googleapis@0cfe2ce

feat: publish AllocationEndpoint v1alpha API artifacts
  PiperOrigin-RevId: 399552457
  Source-Link: googleapis/googleapis@3ec255e

feat(aiplatform): add vizier service to aiplatform v1 BUILD.bazel
  Committer: @dizcology
  PiperOrigin-RevId: 399538263
  Source-Link: googleapis/googleapis@70d5a82

feat(contactcenterinsights): add metadata from dialogflow related to transcript segment feat: add sentiment data for transcript segment feat: add obfuscated if from dialogflow
  PiperOrigin-RevId: 399513805
  Source-Link: googleapis/googleapis@0766e6d

chore: regenerate API index

  Source-Link: googleapis/googleapis@47b2171

fix(ruby)!: Fix Ruby namespace for videointelligence/v1p3beta1
  PiperOrigin-RevId: 399448269
  Source-Link: googleapis/googleapis@f75ccc2

docs(monitoring/metricsscope): update product documentation url for monitoring metrics scopes
  PiperOrigin-RevId: 399443900
  Source-Link: googleapis/googleapis@6ce857f