[http] Update Trace Instrumentation to align with changes in .NET 9.0

[vishweshbankwar]

Component

OpenTelemetry.Instrumentation.Http

Is your feature request related to a problem?

Starting with .NET 9.0, HttpClient will automatically add tags to activities by default dotnet/runtime PR #104251, following the HTTP semantic conventions. To avoid redundant tagging within our instrumentation, we need to skip adding these tags for targets running on .NET 9.0 and above. This is the only adjustment required.

We will continue supporting the Enrich and Filters callbacks since the equivalent APIs are not affected by the changes in .NET 9.0.

It's essential to ensure consistent behavior in .NET 9.0 compared to earlier versions to prevent breaking changes for users migrating to .NET 9.0.

What is the expected behavior?

Continued support for http instrumentation for users targeting .NET9.0

Which alternative solutions or features have you considered?

NA

Additional context

No response