v2: handle root path with basename when using Single Fetch

[ThisIsAreku]

Using v3_singleFetchwith a basename set (i.e. /foo/), a data loader should request /foo/_root.data instead of /foo.data, as the later is outside the basename.

This PR port the patch of remix-run/react-router#12295 (comment) into the remix v2 branch

Closes: #10212

[changeset-bot]

🦋 Changeset detected

Latest commit: dc8a1ee

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 19 packages

Name	Type
@remix-run/react	Patch
@remix-run/server-runtime	Patch
@remix-run/dev	Patch
@remix-run/testing	Patch
@remix-run/cloudflare	Patch
@remix-run/deno	Patch
@remix-run/node	Patch
@remix-run/cloudflare-pages	Patch
@remix-run/cloudflare-workers	Patch
@remix-run/fs-routes	Patch
@remix-run/route-config	Patch
@remix-run/routes-option-adapter	Patch
@remix-run/architect	Patch
@remix-run/express	Patch
@remix-run/serve	Patch
create-remix	Patch
remix	Patch
@remix-run/css-bundle	Patch
@remix-run/eslint-config	Patch

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[brophdawg11]

Can this be updated to instead port over the final solution in v7 from remix-run/react-router#12898? That way we're not accessing global window values from deep inside other code and instead minimize/localize our access to window globals