services/horizon/internal/integration: Add load test which generates ledgers loaded with soroban Tx Meta #4455

Job	Run time
Test (and push) verify-range image	2m 14s
Integration tests (ubuntu-20.04, 1.21, 12, 21)	39m 15s
Integration tests (ubuntu-20.04, 1.21, 12, 22)	39m 13s
Integration tests (ubuntu-20.04, 1.21, 16, 21)	39m 14s
Integration tests (ubuntu-20.04, 1.21, 16, 22)	39m 15s
Integration tests (ubuntu-20.04, 1.22, 12, 21)	39m 15s
Integration tests (ubuntu-20.04, 1.22, 12, 22)	39m 14s
Integration tests (ubuntu-20.04, 1.22, 16, 21)	39m 14s
Integration tests (ubuntu-20.04, 1.22, 16, 22)	39m 13s
Integration tests (ubuntu-22.04, 1.21, 12, 21)	39m 13s
Integration tests (ubuntu-22.04, 1.21, 12, 22)	39m 13s
Integration tests (ubuntu-22.04, 1.21, 16, 21)	39m 13s
Integration tests (ubuntu-22.04, 1.21, 16, 22)	39m 12s
Integration tests (ubuntu-22.04, 1.22, 12, 21)	39m 12s
Integration tests (ubuntu-22.04, 1.22, 12, 22)	39m 12s
Integration tests (ubuntu-22.04, 1.22, 16, 21)	39m 13s
Integration tests (ubuntu-22.04, 1.22, 16, 22)	39m 11s
	10h 29m 46s

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