chore: remove rayon on wasm targets

[Brooooooklyn]

Description

Also add a CI to check the wasm32-wasi-preview1-threads target compiles.

[Brooooooklyn]

• chore: remove rayon on wasm targets #845 👈
• main

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[netlify]

✅ Deploy Preview for rolldown-rs canceled.

Name	Link
🔨 Latest commit	93bff30
🔍 Latest deploy log	https://app.netlify.com/sites/rolldown-rs/deploys/661a3a51164a4600082d3d0d

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.65%. Comparing base (f2c0b8a) to head (99aa6fe).
Report is 1 commits behind head on main.

❗ Current head 99aa6fe differs from pull request most recent head 93bff30. Consider uploading reports for the commit 93bff30 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #845      +/-   ##
==========================================
+ Coverage   80.50%   80.65%   +0.15%     
==========================================
  Files         133      133              
  Lines        6679     6731      +52     
==========================================
+ Hits         5377     5429      +52     
  Misses       1302     1302              

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[codspeed-hq]

CodSpeed Performance Report

Merging #845 will not alter performance

_{Comparing 04-13-chore_remove_rayon_on_wasm_targets (93bff30) with main (749fe51)}

Summary

✅ 6 untouched benchmarks