Generate library for `google/cloud/visionai/v1/visionai_v1.yaml`

Currently blocked on the allowlist:

```
go run github.com/googleapis/librarian/cmd/librarian@${V} add google/cloud/visionai/v1
go: github.com/googleapis/librarian@v0.8.4-0.20260311134127-181b74e0c0d8 requires go >= 1.26.1; switching to go1.26.1
2026/03/11 13:45:31 librarian: failed to create model config: API google/cloud/visionai/v1 is not allowed for language rust
exit status 1
```
