Update bufbuild plugin references

[mfridman]

Hey there, I noticed you were referencing old Remote Plugins in the buf.gen.yaml file. There are some upcoming Remote Plugin changes and this change ensures you're not affected.

This PR updates the plugin references to the Buf-managed plugins.

I ran buf generate -v api to double-check the same files are generated:

proto/gen/
├── aurae.cells.v0.rs
├── aurae.cells.v0.serde.rs
├── aurae.cells.v0.tonic.rs
├── aurae.discovery.v0.rs
├── aurae.discovery.v0.serde.rs
├── aurae.discovery.v0.tonic.rs
├── aurae.observe.v0.rs
├── aurae.observe.v0.serde.rs
├── aurae.observe.v0.tonic.rs
├── aurae.vms.v0.rs
├── aurae.vms.v0.serde.rs
├── aurae.vms.v0.tonic.rs
├── grpc.health.v1.rs
├── grpc.health.v1.serde.rs
├── grpc.health.v1.tonic.rs
├── runtime.v1.rs
├── runtime.v1.serde.rs
└── runtime.v1.tonic.rs

And the .ts files

auraescript/gen
├── cri
│   └── v1
│       └── release-1.26.ts
├── grpc
│   └── health
│       └── v1
│           └── health.ts
└── v0
    ├── cells
    │   └── cells.ts
    ├── discovery
    │   └── discovery.ts
    ├── observe
    │   └── observe.ts
    └── vms
        └── vms.ts

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[mfridman]

@cla-bot check

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The cla-bot has been summoned, and re-checked this pull request!

[dmah42]

sorry, in between the delay before looking at this it was handled through another PR. thank you for trying to protect us from something that actually did hit us eventually.