fix(linter/import-first): correctly respect all relative path imports

[mohitk05]

Closes: #17020

Update path pattern check for is_relative_import in import/first eslint rule and add supporting tests.

[camc314]

Thank yoU!

[codspeed-hq]

CodSpeed Performance Report

Merging #17268 will not alter performance

_{Comparing mohitk05:17020-fix-import-first (88a12a5) with main (4ac23e1)}

Summary

✅ 4 untouched
⏩ 41 skipped¹

Footnotes

1. 41 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩