[MIRROR] Changes default_mutant_bodyparts list to be index based #1933

Job	Run time
Collect data for other tasks	19s
Run Linters	3m 14s
Compile Maps	25s
Windows Build	1m 35s
Integration Tests (birdshot) / run_integration_tests	1m 14s
Integration Tests (blueshift) / run_integration_tests	1m 13s
Integration Tests (icebox) / run_integration_tests	1m 6s
Integration Tests (gateway_test) / run_integration_tests	1m 5s
Integration Tests (kilostation2) / run_integration_tests	1m 13s
Integration Tests (deltastation) / run_integration_tests	1m 11s
Integration Tests (metastation) / run_integration_tests	1m 2s
Integration Tests (multiz_debug) / run_integration_tests	1m 4s
Integration Tests (northstar) / run_integration_tests	1m 23s
Integration Tests (nssjourney) / run_integration_tests	1m 3s
Integration Tests (runtimestation) / run_integration_tests	1m 8s
Integration Tests (tramstation) / run_integration_tests	1m 24s
Integration Tests (voidraptor) / run_integration_tests	58s
Alternate Tests (515, 1603, runtimestation) / run_integration_tests	1m 9s
Check Alternate Tests	0s
Compare Screenshot Tests	14s
	22m 0s

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