Data set on the TransactionTracer is dropped when the tracer gets converted to a SentryTransaction

[jamescrosswell]

The tracer has a SetData method:

sentry-dotnet/src/Sentry/TransactionTracer.cs

Line 277 in dcb8bd7

public void SetData(string key, object? value) => _data[key] = value;

However this never gets used when creating a transaction from a tracer:

sentry-dotnet/src/Sentry/SentryTransaction.cs

Lines 266 to 269 in 4169cb7

	_breadcrumbs = tracer.Breadcrumbs.ToList();
	_tags = tracer.Tags.ToDict();
	_spans = FromTracerSpans(tracer);

Internally the SentryTransaction defers to _contexts.Trace.Data to store extra data...

TransactionTracer.Contexts.Trace.SetData does work... however this isn't obvious to SDK users. Maybe TransactionTracer.Data should also just wrap TransactionTracer.Contexts.Trace.Data and TransactionTracer.SetData should just call TransactionTracer.Contexts.Trace.SetData?

[linear]

NET-585