Add a `SKIP_ORION` option to the start script #5978

Job	Run time
MacOS Checks (18.x)	8m 26s
Ubuntu Checks (18.x)	5m 29s
Build joystream/node	39s
Tests (full)	1h 0m 3s
Tests (setupNewChain)	13m 2s
Tests (setupNewChainMultiStorage)	13m 23s
Runtime Upgrade from production runtime	31s
Tests (bonding)	14m 52s
Tests (storageSync)	22m 47s
	2h 19m 12s

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