Remove obsolete span attributes

[dyladan]

Most of these sound like obsolete attributes that are represented/named differently

• grpc.kind should be represented as the Span Kind
• grpc.status_code should be rpc.grpc.status_code
• grpc.error_name is redundant with the code
• gprc.status_message is probably worth filing a spec PR for (as rpc.grpc.status_message). The span status message might not be ideal to use for it, for the same reason we don't mark spans as failed in RecordException.
• http.status_text was deemed useless and removed without replacement, see Remove semantic convention for http.status_text opentelemetry-specification#950.
• http.error_name, http.status_text: No idea what these are.

Originally posted by @Oberon00 in #2083 (comment)

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[legendecas]

grpc.kind is removed in #3127.

[github-actions]

This issue is stale because it has been open 60 days with no activity. Remove stale label or comment or this will be closed in 14 days.