Always check for call success in `ScillaConnector` (#735) #528

Job	Run time
Build image with Makefile (devex)	3m 51s
Build image with Makefile (zilliqa-isolated-server)	1m 30s
Deploy image (bluebell-playground)	1m 53s
Deploy image (devex-apollo)	51s
Deploy image (dev-wallet)	1m 47s
Deploy image (faucet-service)	43s
Deploy image (eth-spout)	4m 34s
Deploy image (governance-api)	47s
Deploy image (governance-snapshot)	1m 53s
Deploy image (multisig)	1m 54s
Deploy image (neo-savant)	3m 2s
Deploy image (scilla-server)	1m 8s
Deploy image (zillion)	1m 53s
	25m 46s

Provide feedback