services/horizon: Remove --parallel-job-size config parameter used for reingestion. #4326

Job	Run time
Integration tests (ubuntu-20.04, 1.21, 12, 21)	57s
Integration tests (ubuntu-20.04, 1.21, 12, 21)	1m 24s
Integration tests (ubuntu-20.04, 1.21, 12, 21)	1m 24s
Test (and push) verify-range image	2m 10s
Test (and push) verify-range image	2m 8s
Test (and push) verify-range image	2m 8s
Integration tests (ubuntu-20.04, 1.21, 16, 21)	58s
Integration tests (ubuntu-20.04, 1.21, 16, 21)	1m 23s
Integration tests (ubuntu-20.04, 1.21, 16, 21)	1m 23s
Integration tests (ubuntu-20.04, 1.22, 12, 21)	54s
Integration tests (ubuntu-20.04, 1.22, 12, 21)	1m 22s
Integration tests (ubuntu-20.04, 1.22, 12, 21)	1m 22s
Integration tests (ubuntu-20.04, 1.22, 16, 21)	1m 1s
Integration tests (ubuntu-20.04, 1.22, 16, 21)	1m 15s
Integration tests (ubuntu-20.04, 1.22, 16, 21)	1m 15s
Integration tests (ubuntu-22.04, 1.21, 12, 21)	56s
Integration tests (ubuntu-22.04, 1.21, 12, 21)	1m 8s
Integration tests (ubuntu-22.04, 1.21, 12, 21)	47m 23s
Integration tests (ubuntu-22.04, 1.21, 16, 21)	53s
Integration tests (ubuntu-22.04, 1.21, 16, 21)	1m 14s
Integration tests (ubuntu-22.04, 1.21, 16, 21)	1m 14s
Integration tests (ubuntu-22.04, 1.22, 12, 21)	55s
Integration tests (ubuntu-22.04, 1.22, 12, 21)	1m 12s
Integration tests (ubuntu-22.04, 1.22, 12, 21)	1m 12s
Integration tests (ubuntu-22.04, 1.22, 16, 21)	49s
Integration tests (ubuntu-22.04, 1.22, 16, 21)	1m 15s
Integration tests (ubuntu-22.04, 1.22, 16, 21)	1m 15s
	1h 20m 30s

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