Fix flaky tests

[sveitser]

When running tests locally with just test it's currently rather rare that it all passes. We should fix this.

Tests that sometimes fail:

• [ ] non_permissioned::test::test_non_permissioned_builder (fails often)
• [ ] api::fs::generic_tests::catchup_test_with_query_module
• [ ] api::test::state_signature_test_without_query_module
• [ ] persistence::sql::generic_tests::test_voted_view
• [ ] hotshot_commitment::test::test_idempotency
• [ ] api::test::test_merklized_state_api (does not fail but runs seemingly forever)

There are some more flaky tests but I lost that console output. If you find more flaky tests please at them here.

Note that failures are sometimes be caused by other tests interfering with the failing test.