feat!: disable .swcrc reading in JavaScript compiler

[CPunisher]

Summary

This PR removes the logic for searching, loading, and parsing .swcrc files within the JavaScriptCompiler.

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

[netlify]

✅ Deploy Preview for rspack-v2 canceled.

Name	Link
🔨 Latest commit	f37463d
🔍 Latest deploy log	https://app.netlify.com/projects/rspack-v2/deploys/695f383d34c931000863adef

[github-actions]

Rsdoctor Bundle Diff Analysis

Found 5 projects in monorepo, 0 projects with changes.

📊 Quick Summary

Project	Total Size	Change
react-10k	5.7 MB	0
react-1k	825.4 KB	0
react-5k	2.7 MB	0
rome	984.3 KB	0
ui-components	2.1 MB	0

Generated by Rsdoctor GitHub Action

[github-actions]

📦 Binary Size-limit

Comparing f37463d to fix(lint): enable @typescript-eslint/require-await rule (#12664) by Tu Shaokun

🎉 Size decreased by 358.25KB from 47.87MB to 47.52MB (⬇️0.73%)

[codspeed-hq]

Merging this PR will not alter performance

Summary

✅ 16 untouched benchmarks
⏩ 1 skipped benchmark¹

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_{Comparing 01-07-feat-2/disable-swcrc (f37463d) with main (4ecc5cb)²}

Footnotes

1. 1 benchmark was skipped, so the baseline result was used instead. If it was deleted from the codebase, click here and archive it to remove it from the performance reports. ↩

2. No successful run was found on v2 (907c01d) during the generation of this report, so main (4ecc5cb) was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩