chore: "hide" ./defaultWorker entrypoint with types: null

[Andarist]

I moved types condition to the front. package.json#exports are order-sensitive - they are always matched from the top to the bottom. When a match is found then it should be used and no further matching should occur.

Right now, the current setup works in TypeScript but it's considered a bug and it should not be relied upon, see the thread and the comment here. For that reason, I would like to fix all popular packages that misconfigured their exports this way so the bug can be fixed in TypeScript.

⚠️ this PR focuses solely on fixing "🐛 Used fallback condition" problem but the "🎭 Masquerading as CJS" remains here. You can check how such an error is reported here

This is basically the same kind of a PR that was already merged in here: discordjs/discord-api-types#763

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[Andarist]

@didinele adjusted the content and the PR's title, would you mind taking another look?

[github-actions]

⚡️ Lighthouse report for the changes in this PR:

Category	Score
🟢 Performance	99
🟢 Accessibility	100
🟢 Best practices	100
🟢 SEO	100
🟠 PWA	70

Lighthouse ran on https://discord-js-git-fork-andarist-fix-types-condition-discordjs.vercel.app/

[codecov]

Codecov Report

Merging #9485 (2719b97) into main (3e80f0b) will decrease coverage by 0.03%.
The diff coverage is n/a.

❗ Current head 2719b97 differs from pull request most recent head 49ab527. Consider uploading reports for the commit 49ab527 to get more accurate results

@@            Coverage Diff             @@
##             main    #9485      +/-   ##
==========================================
- Coverage   58.56%   58.53%   -0.03%     
==========================================
  Files         226      227       +1     
  Lines       14762    14769       +7     
  Branches     1266     1267       +1     
==========================================
  Hits         8645     8645              
- Misses       6077     6084       +7     
  Partials       40       40              

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