chore(lint): setup `eslint-config-flat-gitignore` (#2963) #2266

Job	Run time
Lint	48s
Test without ESLint Stylistic	2m 8s
Test with ESLint v8	2m 16s
Test (lts/*)	2m 2s
Test (20)	2m 9s
Test (21)	2m 14s
Test with old ESLint Stylistic (2)	2m 16s
Test with typescript-eslint v7	2m 14s
Test (18)	2m 14s
Test with old ESLint Stylistic (3)	2m 10s
Test with old ESLint Stylistic (4)	2m 15s
	22m 46s

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