Update cloud-api protos to v0.12.0

[chndler]

What was changed

• Bumped cloud-api from v0.8.0 to v0.12.0
  • Added new auditlog and billing proto packages
  • Added 10 new RPC endpoint wrappers: GetCurrentIdentity, GetAuditLogs, CreateBillingReport, GetBillingReport, CreateAccountAuditLogSink, GetAccountAuditLogSink, GetAccountAuditLogSinks, UpdateAccountAuditLogSink, DeleteAccountAuditLogSink, GetNamespaceCapacityInfo
  • Added grpc-gateway protoc-gen-openapiv2 protos (new dependency introduced by the updated service.proto)

Why?

Checklist

1. Closes

2. How was this tested:

3. Any docs updates needed?

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Note

Medium Risk
Updates the Cloud API surface (new proto packages, new RPCs, and changed HTTP paths for validation endpoints), which can break clients that depend on the previous proto schema or REST mappings.

Overview
Bumps the vendored api_cloud_upstream protos from v0.8.0 to v0.12.0, including updated Buf/OpenAPI generation config (new grpc-gateway dependency, newer protoc-gen-openapiv2, and disable_service_tags).

Expands the Cloud Ops API with new audit logging, billing, identity, and capacity functionality: adds auditlog and billing proto packages, introduces new CloudService RPC wrappers (GetCurrentIdentity, GetAuditLogs, audit log sink CRUD, GetNamespaceCapacityInfo, CreateBillingReport, GetBillingReport), and wires them through the Rust client (crates/client/src/grpc.rs) and C bridge dispatcher (sdk-core-c-bridge/src/client.rs).

Also updates proto schemas for audit log sinks and namespace capacity (new CapacitySpec/Capacity/NamespaceCapacityInfo) and adjusts REST HTTP mappings for validation endpoints (export sink validate and account audit log sink validate) while adding extensive OpenAPI v2 annotations to cloudservice.

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