speed up DB itests #2354

Job	Run time
ci-lint	24s
build-forest	5m 30s
build-debug	5m 24s
gofmt	28s
setup-params	6s
build-calibnet	5m 16s
lint	4m 19s
build-supraseal-ubuntu24	6m 33s
build-2k	5m 16s
mod-tidy-check	54s
gen-check	6m 50s
build-mainnet	5m 24s
test (test-itest-curio, ./itests/curio_test.go)	5m 31s
test (test-itest-alertnow, ./itests/alertnow_test.go)	3m 9s
test (test-all, `go list ./... \| grep -v curio/itests`)	5m 2s
test (test-itest-harmonyDB, ./itests/harmonydb_test.go)	2m 31s
test (test-itest-pdp-prove, ./itests/pdp_prove_test.go)	1m 42s
coverage-report	29s
required-checks-passed	3s
	1h 4m 51s

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