Replace grpcbin.test.k6.io with QuickPizza

[federicotdn]

What?

Part of https://github.com/grafana/k6-cloud/issues/2437.
Replaces all uses of the old grpcbin.test.k6.io with the new gRPC endpoints in QuickPizza.

Checklist

• I have used a meaningful title for the PR.
• I have described the changes I've made in the "What?" section above.
• I have performed a self-review of my changes.
• I have run the npm start command locally and verified that the changes look good.

• I have made my changes in the docs/sources/next folder of the documentation.
• I have reflected my changes in the docs/sources/v{most_recent_release} folder of the documentation.
• I have reflected my changes in the relevant folders of the two previous k6 versions of the documentation (if still applicable to previous versions).

• I have made my changes in the docs/sources/next folder of the documentation.

Related PR(s)/Issue(s)

[olegbespalov]

Do QuickPizza gRPC endpoints have any streaming capabilities, if yes, we could also benefit from updating our gRPC streaming examples (like https://grafana.com/docs/k6/next/javascript-api/k6-net-grpc/stream/stream-on/) which currently require running a local gRPC server?

[heitortsergent]

LGTM! I was able to run one of the updated examples pointing to grpc-quickpizza.grafana.com:443.

If you can please apply the changes to the latest and previous two versions, I think this should be good to merge.

[federicotdn]

@olegbespalov I need to do many changes to the docs so I'm trying to not add additional examples, however if we wanted to extend Quickpizza, then we only need to update https://github.com/grafana/quickpizza/blob/main/proto/quickpizza.proto and https://github.com/grafana/quickpizza/blob/main/pkg/grpc/grpc.go (should be super quick).