opentelemetry-exporter-otlp-proto-grpc: remove dependence on incubating rpc.response.status_code semconv attribute

[herin049]

Description

Removes the dependence on the incubating rpc.response.status_code semconv attribute in the OTLP gRPC exporter.

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

uv run tox -e py314-test-opentelemetry-exporter-otlp-proto-grpc-latest

Does This PR Require a Contrib Repo Change?

• Yes. - Link to PR:
• No.

Checklist:

• Followed the style guidelines of this project
• Changelogs have been updated
• Unit tests have been added

[xrmx]

@herin049 Could you please elaborate on why we do want this?

[herin049]

@herin049 Could you please elaborate on why we do want this?

opentelemetry.semconv._incubating.attributes.rpc_attributes is internal, so it is not expected to be stable across minor versions. However the gRPC exporter has the requirement opentelemetry-sdk ~= 1.44.0.dev which is a lie.

It's the same argument for not importing internal methods from the SDK into exporter packages.