Fix markdown URL check false negatives in CI/CD #1570

Job	Run time
lint (npm run lint:eslint, macos)	1m 24s
lint (npm run lint:eslint, ubuntu)	1m 16s
pylint (macos)	11s
lint (npm run lint:eslint, windows)	6m 19s
lint (npm run lint:yaml, macos)	55s
pylint (ubuntu)	13s
lint (npm run lint:yaml, ubuntu)	43s
pylint (windows)	31s
lint (npm run lint:yaml, windows)	4m 27s
todo-check	1s
lint (npm run lint:md, macos)	1m 11s
validate-collection-files (macos)	13s
lint (npm run lint:md, ubuntu)	42s
validate-collection-files (ubuntu)	21s
lint (npm run lint:md, windows)	2m 41s
validate-collection-files (windows)	48s
lint (npm run lint:md:consistency, macos)	55s
lint (npm run lint:md:consistency, ubuntu)	44s
lint (npm run lint:md:consistency, windows)	4m 21s
lint (npm run lint:md:relative-urls, macos)	56s
lint (npm run lint:md:relative-urls, ubuntu)	49s
lint (npm run lint:md:relative-urls, windows)	4m 14s
lint (npm run lint:md:external-urls, macos)	1m 55s
lint (npm run lint:md:external-urls, ubuntu)	1m 51s
lint (npm run lint:md:external-urls, windows)	6m 28s
	44m 9s

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