chore(all): auto-regenerate .pb.go files (#659)

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#4652

Changes:

chore(bazel): update Go GAPIC generator to v0.23.0
  PiperOrigin-RevId: 391849098
  Source-Link: googleapis/googleapis@0b89606

chore(bazel): update rules_gapic to v0.6.0
  PiperOrigin-RevId: 391841614
  Source-Link: googleapis/googleapis@7cb3f3b

build(datacatalog): change links to make them absolute
  PiperOrigin-RevId: 391801304
  Source-Link: googleapis/googleapis@84b7c63

feat: Add BigQueryAuditMetadata proto. The BigQueryAuditMetadata proto is used by BigQuery Cloud Audit Logging. It is encoded as a google.protobuf.Struct message inside the metadata field of the AuditLog proto
  PiperOrigin-RevId: 391764852
  Source-Link: googleapis/googleapis@ed73949