fix(fs-routes): resolve route file outside of app dir relative to app dir

[frodi-karlsson]

Fixes #13063

Sorry about the force push. Needed to rebase onto latest dev for contributors.yml update. Re-tested without these changes on the updated version.

Side-note: Are only issues with accepting-prs eligible for community contributions?

sergiodxa on Discord had an answer hours earlier:

There’s no “good first bug” or “good first issue” on the repo, you can check the repo for issues and if something seems easy send a PR

[changeset-bot]

🦋 Changeset detected

Latest commit: f18e280

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

This PR includes changesets to release 11 packages

Name	Type
@react-router/fs-routes	Patch
create-react-router	Patch
react-router	Patch
react-router-dom	Patch
@react-router/architect	Patch
@react-router/cloudflare	Patch
@react-router/dev	Patch
@react-router/express	Patch
@react-router/node	Patch
@react-router/remix-routes-option-adapter	Patch
@react-router/serve	Patch

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