services/horizon/internal/integration: Add load test which generates ledgers loaded with soroban Tx Meta #4457

Job	Run time
Test (and push) verify-range image	2m 38s
Integration tests (ubuntu-20.04, 1.21, 12, 21)	52m 3s
Integration tests (ubuntu-20.04, 1.21, 12, 22)	49m 40s
Integration tests (ubuntu-20.04, 1.21, 16, 21)	49m 20s
Integration tests (ubuntu-20.04, 1.21, 16, 22)	52m 31s
Integration tests (ubuntu-20.04, 1.22, 12, 21)	48m 40s
Integration tests (ubuntu-20.04, 1.22, 12, 22)	49m 14s
Integration tests (ubuntu-20.04, 1.22, 16, 21)	46m 8s
Integration tests (ubuntu-20.04, 1.22, 16, 22)	48m 46s
Integration tests (ubuntu-22.04, 1.21, 12, 21)	51m 47s
Integration tests (ubuntu-22.04, 1.21, 12, 22)	52m 46s
Integration tests (ubuntu-22.04, 1.21, 16, 21)	50m 3s
Integration tests (ubuntu-22.04, 1.21, 16, 22)	51m 5s
Integration tests (ubuntu-22.04, 1.22, 12, 21)	49m 26s
Integration tests (ubuntu-22.04, 1.22, 12, 22)	50m 45s
Integration tests (ubuntu-22.04, 1.22, 16, 21)	45m 51s
Integration tests (ubuntu-22.04, 1.22, 16, 22)	51m 48s
	13h 22m 31s

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