fix: exclude next.js rsc request headers

[hrishikesh-k]

https://linear.app/netlify/issue/EX-1209

When making a RSC request, Next.js appends the following headers:

RSC: 1
Next-Router-State-Tree: {"children":["posts",{}]}
Next-Router-Prefetch: 1

This PR now excludes requests with those headers as we cannot just exclude the query param. This should hopefully help with some of it, if not all.

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