roachtest: fix costfuzz and unoptimized-query-oracle setups #90221
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This commit fixes a bug that was recently introduced when registering the costfuzz and unoptimized-query-oracle tests. This bug was due to the well-known range loop variable issue described here: golang/go#20733.
This commit also adds some additional logging and debug information to help with future issues with these test cases.
Fixes #90010
Release note: None