fix: exclude .scss files from extract-experimental build

[panbenson]

Description

Prevents esbuild from erroring on .scss files during lingui extract-experimental. Although this can be solved locally with experimental.extractor.excludeExtensions, I figured the .scss extension is common enough that this PR may help someone else further on.

Below is the error I got when running the build:

✘ [ERROR] No loader is configured for ".scss" files: someStyle.scss

    someJSFile.js:7:19:
      7 │ import styles from './someStyle.scss';
        ╵                    ~~~~~~~~~~~~~~~~~~~~

When I add .scss to the excluded extensions, message extraction proceeds as expected.

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Examples update

Fixes # (issue)

Checklist

• I have read the CONTRIBUTING and CODE_OF_CONDUCT docs
• I have added tests that prove my fix is effective or that my feature works
• I have added the necessary documentation (if appropriate)

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Name	Status	Preview	Comments	Updated (UTC)
js-lingui	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 13, 2024 8:50pm

[github-actions]

size-limit report 📦

Path	Size
./packages/core/dist/index.mjs	2.87 KB (0%)
./packages/detect-locale/dist/index.mjs	723 B (0%)
./packages/react/dist/index.mjs	1.67 KB (0%)
./packages/remote-loader/dist/index.mjs	7.26 KB (0%)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.01%. Comparing base (d6b9698) to head (69ed405).
Report is 19 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1935      +/-   ##
==========================================
- Coverage   76.65%   76.01%   -0.64%     
==========================================
  Files          81       85       +4     
  Lines        2090     2110      +20     
  Branches      533      539       +6     
==========================================
+ Hits         1602     1604       +2     
- Misses        375      393      +18     
  Partials      113      113              

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[thekip]

While this change is very useful, i'm thinking why I didn't implement it originally in the opposite way to include only some extensions... This should make extractor more robust