feat: [VmMigration] introduce upgrade appliance rpc (#5394)

* feat: Rename product
feat: API updates

PiperOrigin-RevId: 461817256

Source-Link: googleapis/googleapis@215f812

Source-Link: googleapis/googleapis-gen@89d4421
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* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

* chore(bazel): update protobuf to v3.21.3

chore(bazel): update gax-java to 2.18.4

PiperOrigin-RevId: 463115700

Source-Link: googleapis/googleapis@52130a9

Source-Link: googleapis/googleapis-gen@6a4d9d9
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* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

* chore(bazel): update gapic-generator-php to v1.5.0

PiperOrigin-RevId: 463455928

Source-Link: googleapis/googleapis@c549596

Source-Link: googleapis/googleapis-gen@434d232
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* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>