refactor!: remove testutil/network #75960

Job	Run time
test-integration	1s
split-test-files	1s
test-clientv2	1s
test-core	1s
test-sim-nondeterminism	1s
test-system	1s
test-collections	1s
test-collections-protocodec	1s
test-coretesting	1s
test-depinject	1s
test-errors	1s
test-indexer-postgres	1s
test-math	1s
test-schema	1s
test-schema-testing	1s
test-simapp	1s
test-simapp-v2	1s
test-confix	1s
test-cosmovisor	1s
test-hubl	1s
test-log	1s
test-orm	1s
test-store	1s
test-store-v2	1s
test-x-accounts	1s
test-x-accounts-base	1s
test-x-accounts-lockup	1s
test-x-accounts-multisig	1s
test-x-circuit	1s
test-x-distribution	1s
test-x-evidence	1s
test-x-feegrant	1s
test-x-nft	1s
test-x-params	1s
test-x-protocolpool	1s
test-x-tx	1s
test-x-authz	1s
test-x-bank	1s
test-x-gov	1s
test-x-group	1s
test-x-slashing	1s
test-x-staking	1s
test-x-upgrade	1s
test-x-consensus	1s
test-x-epochs	1s
test-x-mint	1s
tests	1s
repo-analysis	1s
	48s

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