[MIRROR] Adds a proper skeletal rack subtype (#2030) #4483

Job	Run time
Run Linters	2m 41s
Collect data for other tasks	23s
Windows Build	1m 53s
Compile Maps	3m 20s
Integration Tests (blueshift) / run_integration_tests	11m 56s
Integration Tests (birdshot) / run_integration_tests	11m 8s
Integration Tests (deltastation) / run_integration_tests	11m 19s
Integration Tests (icebox) / run_integration_tests	11m 24s
Integration Tests (kilostation2) / run_integration_tests	10m 57s
Integration Tests (gateway_test) / run_integration_tests	12m 30s
Integration Tests (metastation) / run_integration_tests	11m 10s
Integration Tests (multiz_debug) / run_integration_tests	10m 40s
Integration Tests (northstar) / run_integration_tests	12m 26s
Integration Tests (nssjourney) / run_integration_tests	10m 57s
Integration Tests (runtimestation) / run_integration_tests	9m 52s
Integration Tests (tramstation) / run_integration_tests	11m 25s
Integration Tests (voidraptor) / run_integration_tests	11m 10s
Alternate Tests (515, 1621, runtimestation) / run_integration_tests	10m 23s
Check Alternate Tests	1s
Compare Screenshot Tests	41s
	2h 46m 16s

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