feat(server): use x-cloud-trace-context instead of x-rpc-trace-id (#10068)

x-cloud-trace-context will be overwritten by lb,
and cannot be fake from internet access request

![image.png](https://graphite-user-uploaded-assets-prod.s3.amazonaws.com/hTwOityLamd4hitrae7M/6d3c47c1-ac9e-4bc9-a7f1-2be8f56dbf69.png)

packages/backend/server/src/app.module.ts

@@ -57,7 +57,7 @@ export const FunctionalityModules = [
       generateId: true,
       idGenerator(req: Request) {
         // make every request has a unique id to tracing
-        return req.get('x-rpc-trace-id') ?? genRequestId('req');
+        return req.get('x-cloud-trace-context') ?? genRequestId('req');
       },
       setup(cls, _req, res: Response) {
         res.setHeader('X-Request-Id', cls.getId());