Don't store hashes for unknown subsystems #5461

Job	Run time
launcher (ubuntu-20.04)	4m 35s
launcher (macos-12)	6m 19s
package_builder (ubuntu-20.04)	1m 0s
launcher (windows-latest)	9m 48s
package_builder (macos-12)	1m 28s
package_builder (windows-latest)	5m 40s
Version Baseline	3s
Exec Test (ubuntu-20.04)	4s
Exec Test (ubuntu-22.04)	5s
Exec Test (macos-12)	17s
Exec Test (macos-13)	19s
Exec Test (macos-14)	26s
Exec Test (windows-2019)	13s
Exec Test (windows-2022)	15s
ci_mergeable	1s
Store Artifacts (linux)	7s
Store Artifacts (macos)	12s
Store Artifacts (windows)	9s
	31m 1s

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