Rename rpc.grpc.status_code to rpc.grpc.response.status_code

[XSAM]

Fixes #1504

Changes

Rename rpc.grpc.status_code to rpc.grpc.response.status_code

Merge requirement checklist

• CONTRIBUTING.md guidelines followed.
• Change log entry added, according to the guidelines in When to add a changelog entry.
  • If your PR does not need a change log, start the PR title with [chore]
• schema-next.yaml updated with changes to existing conventions.

[trask]

thanks @XSAM!

I think RPC is one we may want to consider as "de-facto stable" and introduce language like we have done for HTTP, Database, Messaging and System semantic conventions (e.g. see the Warning on https://github.com/open-telemetry/semantic-conventions/blob/main/docs/database/README.md)

It is better for users to get all the breaking changes in a single major version bump instead of lots of small breaking changes over time.

We may also want to wait to kick off these changes until we kick off a semconv RPC stability SIG that is dedicated to working through it.

[maryliag]

considering the comment from Trask about trying to make big changes all at once, should the change to seconds be done on the same PR? It's not the same metrics, but is on the same "group", since is rpc

[trask]

I think we will want to kick off an RPC semconv stabilization effort. I'm interested in helping that effort once database semconv is stabilized.

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[github-actions]

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