Align HTTP tracing with OTEL semantic conventions

[JamesNK]

Is there an existing issue for this?

• [X] I have searched the existing issues

Is your feature request related to a problem? Please describe the problem.

ASP.NET Core tracing was added years ago. Since then OTel has written semantic conventions for naming and metadata in HTTP spans.

Describe the solution you'd like

We should consider whether to change our built-in tracing to follow the standard. Following the standard would reduce the need to use OTel libraries which currently translate our data into the OTel standard. Changing activity and tag names would be a breaking change.

Additional context

No response