feat: new gitignore #6536

Job	Run time
get-lint-packages	5s
get-build-packages	5s
monorepo-lint	1m 9s
get-test-packages	4s
test (eslint-plugin-isaacscript)	43s
test (isaacscript-cli)	38s
build (isaac-typescript-definitions)	40s
build (isaacscript-cli)	46s
build (docs)	34s
build (isaacscript-common)	1m 6s
build (isaac-typescript-definitions-repentogon)	37s
build (eslint-plugin-isaacscript)	40s
build (isaac-lua-polyfill)	34s
lint (isaacscript-cli)	56s
lint (isaac-lua-polyfill)	42s
lint (eslint-config-isaacscript)	42s
lint (isaacscript-common)	1m 28s
lint (isaac-typescript-definitions)	55s
lint (docs)	47s
lint (eslint-plugin-isaacscript)	55s
lint (isaac-typescript-definitions-repentogon)	48s
lint (isaacscript-spell)	45s
Discord Failure Notification	0s
	15m 39s

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