Make eslint-compact matcher compatible with Stylelint

[FloEdelmann]

Stylelint has a compact formatter that is (nearly) compatible with ESLint one's.

It outputs lowercase severity strings though, so eslint-compact matcher's RegExp is not triggered.

This PR changes the matcher to also match lowercase severity strings.

Alternatively, the matcher could be duplicated as stylelint-compact and both RegExps could target exact lowercase/uppercase severities.

---

Example check run containing Stylelint output: https://github.com/OpenLightingProject/open-fixture-library/pull/1163/checks?check_run_id=365592295

[ybiquitous]

I really want this update! 🙏

[bryanmacfarlane]

any interest in updating PR to target main instead of master?

[FloEdelmann]

@bryanmacfarlane Done :ok_hand:

[Jimimaku]

Stylelint has a compact formatter that is (nearly) compatible with ESLint one's.

It outputs lowercase severity strings though, so eslint-compact matcher's RegExp is not triggered.

This PR changes the matcher to also match lowercase severity strings.

Alternatively, the matcher could be duplicated as stylelint-compact and both RegExps could target exact lowercase/uppercase severities.

Example check run containing Stylelint output: https://github.com/OpenLightingProject/open-fixture-library/pull/1163/checks?check_run_id=365592295

[szepeviktor]

Friendly ping 🏓