fix(remix-dev): normalize /route routeId, update route collision warnings

[mcansh]

updates some missed logic so <dir>/route no longer conflicts in some cases.

updates conflict logic so it no longer throws errors and instead displays a nice error message about your conflicts

 ⚠️ Route Path Collision: "/products/:pid"
 The following routes all define the same URL, only the first one will be used
 🟢️️ routes/products.$pid.tsx
 ⭕️️ routes/products.$productId.tsx

⚠️ Route Path Collision: "/dashboard"
The following routes all define the same URL, only the first one will be used
🟢️️ routes/dashboard/route.tsx
⭕️️ routes/dashboard.tsx

⚠️ Route Path Collision: "/"
The following routes all define the same URL, only the first one will be used
🟢️️ routes/_landing._index.tsx
⭕️️ routes/_dashboard._index.tsx
⭕️ routes/_index.tsx

Closes: #5470
Closes: #5471
Closes: #5495

• Docs
• Tests

Testing Strategy:

• https://github.com/remix-run/remix/pull/5459/files#diff-a06b1f5f341c3dcdd91bfc12a0161adb284981209bc7ef6ea129e62a3d513f82
• https://github.com/remix-run/remix/pull/5459/files#diff-9d539a136164c63dc19ad243c45da2ae620f194929b43c0f01b039ba1fce5241

[changeset-bot]

🦋 Changeset detected

Latest commit: e8447f0

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

This PR includes changesets to release 18 packages

Name	Type
remix	Patch
@remix-run/dev	Patch
create-remix	Patch
@remix-run/css-bundle	Patch
@remix-run/architect	Patch
@remix-run/cloudflare	Patch
@remix-run/cloudflare-pages	Patch
@remix-run/cloudflare-workers	Patch
@remix-run/deno	Patch
@remix-run/eslint-config	Patch
@remix-run/express	Patch
@remix-run/netlify	Patch
@remix-run/node	Patch
@remix-run/react	Patch
@remix-run/serve	Patch
@remix-run/server-runtime	Patch
@remix-run/testing	Patch
@remix-run/vercel	Patch

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[ryanflorence]

I didn't look at the code, just the tests and it looks great :)

[github-actions]

🤖 Hello there,

We just published version v0.0.0-nightly-aecf731-20230222 which includes this pull request. If you'd like to take it for a test run please try it out and let us know what you think!

Thanks!