fix(formatter): correctly handle comments at end of export/import list

[spanishpear]

Summary

Fixes #1589

Happy to receive feedback on the implementation, not sure if there are obvious edge-cases I'm not considering, but it passes the test suite!

Test Plan

Ive added a snapshot from the issue with import/export, and pass the prettier tests

[netlify]

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Lighthouse	1 paths audited Performance: 100 (no change from production) Accessibility: 97 (no change from production) Best Practices: 100 (no change from production) SEO: 93 (no change from production) PWA: - View the detailed breakdown and full score reports

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[Conaclos]

Hi! Thanks for your contribution :)

Ci is failing because some Rust files are not formatted and the website was not updated.
You can run just format (just f) and just gen-web to solve these issues.

[codspeed-hq]

CodSpeed Performance Report

Merging #1603 will not alter performance

_{⚠️ No base runs were found}

_{Falling back to comparing SpanishPear:spanishpear/formatter_last_line_comment_import_list (c8e3d67) with main (efa2911)}

Summary

✅ 93 untouched benchmarks

[spanishpear]

Thanks @Conaclos - looks like my editor formatting is broken 😢

Have pushed up those two commits!

[ematipico]

That's awesome!