chore(all): auto-regenerate .pb.go files (#968)

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#7318

Changes:

feat!: update the API messages to include additional fields from payments and metadata API requests and response processed by the issuer switch
  PiperOrigin-RevId: 504969652
  Source-Link: googleapis/googleapis@5e5519c

chore: regenerate API index

  Source-Link: googleapis/googleapis@a85e6df

chore(billing): reformat protos
  PiperOrigin-RevId: 504926695
  Source-Link: googleapis/googleapis@d8e1dad

feat(networkconnectivity): Update Hub API
  PiperOrigin-RevId: 504700327
  Source-Link: googleapis/googleapis@91b494f

Synchronize new proto/yaml changes.
  PiperOrigin-RevId: 504650872
  Source-Link: googleapis/googleapis@af48be5

feat(documentai): added advanced_ocr_options field in OcrConfig
  PiperOrigin-RevId: 504600937
  Source-Link: googleapis/googleapis@91bee51

chore(lifesciences): reformat protos
  PiperOrigin-RevId: 504406094
  Source-Link: googleapis/googleapis@f2f7edc