Remove deprecated stylelint github formatter

[rpiaggio]

This is only used to format the linter output, it doesn't affect the rules.

[toddburnside]

LGTM

[bundlemon]

BundleMon (Explore)

Files added (1)

Status	Path	Size	Limits
✅	index-Bt98Cg-(hash).js	+2.37MB	-

Unchanged files (8)

Status	Path	Size	Limits
✅	exploreworkers-C3Kt3m-(hash).js	582.35KB	-
✅	exploreworkers-(hash).js	581.86KB	-
✅	index-(hash).css	67.41KB	-
✅	workbox-window.prod.es5-(hash).js	2.05KB	-
✅	plotworker-(hash).js	88B	-
✅	agsworker-(hash).js	86B	-
✅	catalogworker-(hash).js	82B	-
✅	itcworker-(hash).js	78B	-

Total files change +2.37MB +196.77%

Final result: ✅

View report in BundleMon website ➡️

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