Handle data requests with trailing slash consistently

[richardkall]

Fixes #12465

Also needs a future flag as mentioned in #12465 (comment).

Heads up: I’m new to this codebase and used Opus 4.5 to navigate it and make adjustments.

[changeset-bot]

🦋 Changeset detected

Latest commit: 40c53c0

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

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