feat: remove app docker job for integration tests #280

Job	Run time
API test set: accounts.test.ts / Node: lts/*	11m 33s
API test set: addresses.test.ts / Node: lts/*	12m 27s
API test set: batches.test.ts / Node: lts/*	10m 56s
API test set: blocks.test.ts / Node: lts/*	10m 46s
API test set: contracts.test.ts / Node: lts/*	11m 38s
API test set: logs.test.ts / Node: lts/*	11m 7s
API test set: stats.test.ts / Node: lts/*	11m 14s
API test set: tokens.test.ts / Node: lts/*	11m 44s
API test set: transactions.test.ts / Node: lts/*	13m 29s
	1h 44m 54s

Provide feedback