Better E2E tests with the secondary server + 1.20.4 tests support #107

Job	Run time
Build / Prepare	1s
Build / Build / Gradle build	1m 54s
E2E test (1.12.2, velocity) / E2E test (1.12.2, velocity)	57s
E2E test (1.13.2, bungeecord) / E2E test (1.13.2, bungeecord)	1m 36s
E2E test (1.12.2, bungeecord) / E2E test (1.12.2, bungeecord)	1m 20s
E2E test (1.13.2, velocity) / E2E test (1.13.2, velocity)	1m 23s
E2E test (1.16.3, bungeecord) / E2E test (1.16.3, bungeecord)	1m 35s
E2E test (1.16.3, velocity) / E2E test (1.16.3, velocity)	1m 19s
E2E test (1.16.5, bungeecord) / E2E test (1.16.5, bungeecord)	1m 35s
E2E test (1.16.5, velocity) / E2E test (1.16.5, velocity)	1m 29s
E2E test (1.20.1, bungeecord) / E2E test (1.20.1, bungeecord)	1m 30s
E2E test (1.20.1, velocity) / E2E test (1.20.1, velocity)	1m 13s
E2E test (1.8.9, bungeecord) / E2E test (1.8.9, bungeecord)	1m 9s
E2E test (1.8.9, velocity) / E2E test (1.8.9, velocity)	1m 9s
	18m 10s

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