React router middleware instrumentation span's missing context and thus not useful

[gijsroge]

Problem Statement

The middleware span creation doesn't really offer any insight currently as there is no context which middleware it is.

For example

Solution Brainstorm

Maybe this has to be fixed upstream in RR7?

Additional Context

@onurtemizkan

Priority

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[linear]

JS-1601

[chargome]

Not an upstream fix, we'll look into it!