Refactor OpenAPI spec for async-txsub endpoint #3695

Job	Run time
Test and push the Ledger Exporter images	1m 19s
Integration tests (ubuntu-20.04, 1.21, 12, 20)	49m 31s
Integration tests (ubuntu-20.04, 1.21, 12, 21)	48m 33s
Test (and push) verify-range image	2m 15s
Integration tests (ubuntu-20.04, 1.21, 16, 20)	48m 10s
Integration tests (ubuntu-20.04, 1.21, 16, 21)	47m 51s
Integration tests (ubuntu-20.04, 1.22, 12, 20)	47m 9s
Integration tests (ubuntu-20.04, 1.22, 12, 21)	48m 15s
Integration tests (ubuntu-20.04, 1.22, 16, 20)	47m 27s
Integration tests (ubuntu-20.04, 1.22, 16, 21)	47m 27s
Integration tests (ubuntu-22.04, 1.21, 12, 20)	47m 27s
Integration tests (ubuntu-22.04, 1.21, 12, 21)	47m 43s
Integration tests (ubuntu-22.04, 1.21, 16, 20)	47m 47s
Integration tests (ubuntu-22.04, 1.21, 16, 21)	47m 49s
Integration tests (ubuntu-22.04, 1.22, 12, 20)	46m 36s
Integration tests (ubuntu-22.04, 1.22, 12, 21)	46m 55s
Integration tests (ubuntu-22.04, 1.22, 16, 20)	47m 26s
Integration tests (ubuntu-22.04, 1.22, 16, 21)	47m 20s
	12h 47m 0s

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