chore(all): auto-regenerate gapics (#3708)

This is an auto-generated regeneration of the gapic clients by
cloud.google.com/go/internal/gapicgen. Once the corresponding genproto PR is
submitted, genbot will update this PR with a newer dependency to the newer
version of genproto and assign reviewers to this PR.

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

- Ensure that the version of genproto in go.mod has been updated.
- 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.


Corresponding genproto PR: googleapis/go-genproto#533

Changes:

feat(documentai): Update documentai/v1beta3 protos
  PiperOrigin-RevId: 357825340
  Source-Link: googleapis/googleapis@1f68cd0

fix(dialogflow/cx): RunTestCase http template. PHP REST client lib can be generated. feat: Support transition route group coverage for Test Cases.
  PiperOrigin-RevId: 357757017
  Source-Link: googleapis/googleapis@38d77ab

build(orgpolicy): add BUILD files to generate client library for orgpolicy
  PiperOrigin-RevId: 357293749
  Source-Link: googleapis/googleapis@78f5365

feat(gkehub): Update Membership API v1beta1 proto
  PiperOrigin-RevId: 357242088
  Source-Link: googleapis/googleapis@1b2ab49

chore(longrunning): Operations proto comment cleanup
  Committer: @miraleung
  PiperOrigin-RevId: 357075713
  Source-Link: googleapis/googleapis@c059c46

Author: yoshi-automation