fix(ClientRequest): spy on `request.headers` used as init for request

[kettanaito]

• Related to https://github.com/mswjs/msw/issues/2290

Changes

• recordRawHeaders: properly records raw headers for Request that's been used as init for another Request. Also adds raw headers merging in case either of the requests have any raw headers recorded.

[kettanaito]

Released: v0.35.7 🎉

This has been released in v0.35.7!

• 📄 Release notes
• 📦 npm package

Make sure to always update to the latest version (npm i @mswjs/interceptors@latest) to get the newest features and bug fixes.

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