chore(all): auto-regenerate .pb.go files (#965)

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#7277

Changes:

docs: Add documentation for enums
  fix: Add context manager return types

  chore: Update gapic-generator-python to v1.8.1
  PiperOrigin-RevId: 503210727
  Source-Link: googleapis/googleapis@a391fd1

chore(talent): fix proto formatting
  PiperOrigin-RevId: 503206506
  Source-Link: googleapis/googleapis@9064293

docs: Updated documentation for a few fields with trips.proto and vehicle_api.proto
  PiperOrigin-RevId: 503189011
  Source-Link: googleapis/googleapis@2e84009

chore: regenerate API index

  Source-Link: googleapis/googleapis@0a4bebf

chore: fix proto formatting
  PiperOrigin-RevId: 503177089
  Source-Link: googleapis/googleapis@1ccd54b

feat(automl): Enable REST transport in C#
  This change does not affect other languages.

  PiperOrigin-RevId: 503159211
  Source-Link: googleapis/googleapis@9f04c98

feat(servicecontrol): Enable REST transport in C#
  This change does not affect other languages.

  PiperOrigin-RevId: 503125274
  Source-Link: googleapis/googleapis@62915a3

feat(analytics/admin): Enable REST transport in C#
  This change does not affect other languages.

  PiperOrigin-RevId: 503088494
  Source-Link: googleapis/googleapis@fcff1cc

feat(maps/routing): Add ExtraComputations feature to ComputeRoutes and ComputeRouteMatrix
  PiperOrigin-RevId: 503020999
  Source-Link: googleapis/googleapis@23dc63c

feat(dataproc): add SPOT to Preemptibility enum
  PiperOrigin-RevId: 503019826
  Source-Link: googleapis/googleapis@77cd8f1

chore: Update mixin client dependencies to versions that support REST
  PiperOrigin-RevId: 502986815
  Source-Link: googleapis/googleapis@a7ffc3b

chore(batch): reformat protos and add import of google/protobuf/empty.proto
  PiperOrigin-RevId: 502963013
  Source-Link: googleapis/googleapis@2458583

chore(batch): add dependency on google/protobuf/empty.proto
  PiperOrigin-RevId: 502960405
  Source-Link: googleapis/googleapis@d679464

chore: reformat protos and import empty.proto
  PiperOrigin-RevId: 502955048
  Source-Link: googleapis/googleapis@8dbaea4

chore: add a dependency on google/protobuf/empty.proto
  PiperOrigin-RevId: 502953229
  Source-Link: googleapis/googleapis@799696b

feat(orgpolicy): support for OrgPolicy dry runs
  PiperOrigin-RevId: 502948090
  Source-Link: googleapis/googleapis@8f29315

chore(bazel): update rules_gapic to v0.20.1
  PiperOrigin-RevId: 502946172
  Source-Link: googleapis/googleapis@9557816

chore(firestore/apiv1): Disable requesting numeric enums in "transport=rest" responses for nodejs-firestore
  PiperOrigin-RevId: 502893047
  Source-Link: googleapis/googleapis@6adf7b1

feat(billing): Enable REST transport in C#
  This change does not affect other languages.

  PiperOrigin-RevId: 502805862
  Source-Link: googleapis/googleapis@95327f5

feat(aiplatform): add enable_dashboard_access in aiplatform v1 and v1beta1 custom_job.proto
  PiperOrigin-RevId: 502722710
  Source-Link: googleapis/googleapis@6d9a0f3

chore: reformat protos
  PiperOrigin-RevId: 502669926
  Source-Link: googleapis/googleapis@d8ee340

feat(container): Add support for viewing the subnet IPv6 CIDR and services IPv6 CIDR assigned to dual stack clusters
  PiperOrigin-RevId: 502669678
  Source-Link: googleapis/googleapis@1f62a66

chore: regenerate API index

  Source-Link: googleapis/googleapis@5367905

feat(documentai): exposed GetProcessorType to v1
  PiperOrigin-RevId: 502624243
  Source-Link: googleapis/googleapis@bd5f934

chore(bigquery/datatransfer): reformatted service protos
  PiperOrigin-RevId: 502620425
  Source-Link: googleapis/googleapis@ab77d86

chore: regenerate API index

  Source-Link: googleapis/googleapis@a400ee1

feat(documentai): exposed GetProcessorType to v1beta3
  PiperOrigin-RevId: 502616281
  Source-Link: googleapis/googleapis@04e6db9