test: allow underscores in hash for server routes preload links #3505

Job	Run time
list	22s
workflow (devkit-core-tests-rerun)	1m 29s
workflow (build-unit-tests)	2m 13s
workflow (modules-builder-tests)	2m 0s
workflow (build-cli)	1m 44s
workflow (devkit-core-tests)	1m 27s
	9m 15s

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