Add bank pubkey to program logs in lendingPoolConfigureBankInterestOnly

[Henry-E]

Summary

The lendingPoolConfigureBankInterestOnly instruction currently logs the parameter changes but not the bank pubkey being configured. Adding the bank address to the logs would improve transaction verification in multisig workflows.

Current Behavior

When executing lendingPoolConfigureBankInterestOnly, the program logs show:

Program log: Setting self.optimal_utilization_rate to 0.8
Program log: Setting self.plateau_interest_rate to 0.06
Program log: Bank configured!

Desired Behavior

The logs should include the bank pubkey being configured:

Program log: Configuring bank: 2s37akK2eyBbp8DZgCm7RtsaEz8eJP3Nxd4urLHQv7yB
Program log: Setting self.optimal_utilization_rate to 0.8
Program log: Setting self.plateau_interest_rate to 0.06
Program log: Bank configured!

Why This Matters

Having the bank pubkey in logs allows multisig reviewers to verify they're configuring the correct bank and look up its token, group, and current configuration.

Safety

This should be safe to add since the instruction currently consumes ~5,132 CUs and memory usage is presumably very low, but worth verifying there's no edge case impact.

Affected Instructions

• lending_pool_configure_bank_interest_only