services/horizon/internal/integration: Add load test which generates ledgers loaded with soroban Tx Meta #4448

Job	Run time
Test (and push) verify-range image	2m 14s
Integration tests (ubuntu-20.04, 1.21, 12, 21)	49m 20s
Integration tests (ubuntu-20.04, 1.21, 12, 22)	49m 19s
Integration tests (ubuntu-20.04, 1.21, 16, 21)	49m 20s
Integration tests (ubuntu-20.04, 1.21, 16, 22)	49m 19s
Integration tests (ubuntu-20.04, 1.22, 12, 21)	49m 19s
Integration tests (ubuntu-20.04, 1.22, 12, 22)	49m 18s
Integration tests (ubuntu-20.04, 1.22, 16, 21)	49m 20s
Integration tests (ubuntu-20.04, 1.22, 16, 22)	49m 20s
Integration tests (ubuntu-22.04, 1.21, 12, 21)	49m 17s
Integration tests (ubuntu-22.04, 1.21, 12, 22)	49m 18s
Integration tests (ubuntu-22.04, 1.21, 16, 21)	49m 18s
Integration tests (ubuntu-22.04, 1.21, 16, 22)	49m 18s
Integration tests (ubuntu-22.04, 1.22, 12, 21)	49m 2s
Integration tests (ubuntu-22.04, 1.22, 12, 22)	49m 18s
Integration tests (ubuntu-22.04, 1.22, 16, 21)	49m 18s
Integration tests (ubuntu-22.04, 1.22, 16, 22)	49m 19s
	13h 10m 57s

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