[MIRROR] Add `LOWMEMORYMODE` versions of all the build/run tasks (#14… #5305

Job	Run time
Collect data for other tasks	15s
Run Linters	2m 54s
Compile Maps	3m 8s
Windows Build	2m 19s
Integration Tests (birdshot) / run_integration_tests	10m 56s
Integration Tests (blueshift) / run_integration_tests	11m 44s
Integration Tests (icebox) / run_integration_tests	11m 27s
Integration Tests (gateway_test) / run_integration_tests	12m 19s
Integration Tests (deltastation) / run_integration_tests	11m 29s
Integration Tests (kilostation2) / run_integration_tests	11m 11s
Integration Tests (metastation) / run_integration_tests	10m 51s
Integration Tests (multiz_debug) / run_integration_tests	10m 11s
Integration Tests (northstar) / run_integration_tests	11m 59s
Integration Tests (nssjourney) / run_integration_tests	11m 39s
Integration Tests (runtimestation) / run_integration_tests	10m 34s
Integration Tests (tramstation) / run_integration_tests	11m 33s
Integration Tests (voidraptor) / run_integration_tests	11m 16s
Alternate Tests (515, 1627, runtimestation) / run_integration_tests	10m 21s
Check Alternate Tests	1s
Compare Screenshot Tests	1m 34s
	2h 47m 41s

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