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

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.

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Changes:

feat: add new FieldBehavior value IDENTIFIER
  PiperOrigin-RevId: 559119958
  Source-Link: googleapis/googleapis@f5987af

fix!: use correct child_type annotation
  PiperOrigin-RevId: 558967926
  Source-Link: googleapis/googleapis@1c4f24e

docs: Revert HTML formats in comments
  docs: Expand compute resource API docs to match with VM's machine type field

  docs: Clarify Batch API proto doc about pubsub notifications
  PiperOrigin-RevId: 558940776
  Source-Link: googleapis/googleapis@a7ee700

chore: regenerate API index

  Source-Link: googleapis/googleapis@760ee22

chore: Prepare Ruby client libraries for policytroubleshooter/iam
  PiperOrigin-RevId: 558915342
  Source-Link: googleapis/googleapis@0dbf824

regen.txt

@@ -1 +1 @@
-1769846666fbeb0f9ece6ad929ddc0d563cccd8d
+f5987af9df625b86e23aed7218ab5f48e85e4ec8