[Diagnostics] Do not mark GraphQL request span as server span

[tobias-tengler]

No description provided.

[Copilot]

Pull request overview

Updates HotChocolate diagnostics span creation so the “GraphQL Operation” activity is no longer created as a server span, aligning it with the expectation that the incoming transport (e.g., ASP.NET) owns the server span and GraphQL execution should be an internal child activity.

Changes:

• Stop explicitly setting ActivityKind.Server when starting the “GraphQL Operation” activity (defaults to ActivityKind.Internal).

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0.00%. Comparing base (67b637e) to head (e18bc8d).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@     Coverage Diff      @@
##   main   #9444   +/-   ##
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