feat: remove app docker job for integration tests #271

Job	Run time
API test set: accounts.test.ts / Node: lts/*	10m 55s
API test set: addresses.test.ts / Node: lts/*	12m 17s
API test set: batches.test.ts / Node: lts/*	11m 38s
API test set: blocks.test.ts / Node: lts/*	11m 4s
API test set: contracts.test.ts / Node: lts/*	11m 13s
API test set: logs.test.ts / Node: lts/*	11m 8s
API test set: stats.test.ts / Node: lts/*	10m 52s
API test set: tokens.test.ts / Node: lts/*	11m 22s
API test set: transactions.test.ts / Node: lts/*	13m 45s
	1h 44m 14s

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