refactor(testutil): remove x/staking from testutil

[julienrbrt]

Description

Closes: #XXXX

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[github-actions]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[tac0turtle]

still needed

[github-actions]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[julienrbrt]

Closing, will be picked back up if times allow