feat: [AiPlatform] add DeploymentTier enum to DeployedIndex (#8622)

* feat: A new value `NVIDIA_RTX_PRO_6000` is added to enum `AcceleratorType`

PiperOrigin-RevId: 811944758

Source-Link: googleapis/googleapis@bc546b9

Source-Link: googleapis/googleapis-gen@23ebd71
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* 🦉 Updates from OwlBot post-processor

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

* feat: Auto-generated CL for //google/cloud/aiplatform:aiplatform_v1_public_proto_gen

PiperOrigin-RevId: 813096234

Source-Link: googleapis/googleapis@e78280f

Source-Link: googleapis/googleapis-gen@d83eeb4
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* 🦉 Updates from OwlBot post-processor

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

* feat: add DeploymentTier enum to DeployedIndex

PiperOrigin-RevId: 813384393

Source-Link: googleapis/googleapis@063f9e1

Source-Link: googleapis/googleapis-gen@1119646
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* 🦉 Updates from OwlBot post-processor

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

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Author: gcf-owl-bot[bot]