[MIRROR] Removes the old toolbox arena code #4760

Job	Run time
Run Linters	3m 25s
Collect data for other tasks	14s
Compile Maps	3m 49s
Windows Build	1m 55s
Integration Tests (birdshot) / run_integration_tests	11m 2s
Integration Tests (blueshift) / run_integration_tests	13m 0s
Integration Tests (deltastation) / run_integration_tests	12m 17s
Integration Tests (gateway_test) / run_integration_tests	12m 25s
Integration Tests (icebox) / run_integration_tests	11m 49s
Integration Tests (kilostation2) / run_integration_tests	11m 24s
Integration Tests (metastation) / run_integration_tests	11m 12s
Integration Tests (multiz_debug) / run_integration_tests	11m 1s
Integration Tests (northstar) / run_integration_tests	12m 37s
Integration Tests (nssjourney) / run_integration_tests	10m 47s
Integration Tests (runtimestation) / run_integration_tests	10m 37s
Integration Tests (tramstation) / run_integration_tests	12m 8s
Integration Tests (voidraptor) / run_integration_tests	11m 31s
Alternate Tests (515, 1621, runtimestation) / run_integration_tests	9m 46s
Check Alternate Tests	1s
Compare Screenshot Tests	3m 57s
	2h 54m 57s

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