OpenTelemetry: add test coverage #4285
Description
See https://github.com/dotnet/extensions/tree/main/test/Libraries/Microsoft.Extensions.Telemetry.Abstractions.Tests or Microsoft.Extensions.Telemetry.Testing.
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See https://github.com/dotnet/extensions/tree/main/test/Libraries/Microsoft.Extensions.Telemetry.Abstractions.Tests or Microsoft.Extensions.Telemetry.Testing.