fix(tracing): Attach request instrumentation span to active span instead of current transaction #6778
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Currently, the request instrumentation (fetch & XHR) doesn't attach spans to the currently active span on the scope but always on the active transaction.
While trying to instrument fetch for wintercg runtimes I ran into the issue that even when we intentionally set the span on the scope, fetch spans would still end up on the transaction. This PR would fix this behavior by attaching the fetch/xhr span to the currently active span instead.