fix: resolve duplicate charge_fee_to_insurance from squash merge

[dcccrypto]

Summary

• The squash of PR merge: sync upstream aeyakovenko/percolator v12.1 (136 commits) #82 landed two impl RiskEngine methods with the same name charge_fee_to_insurance but different signatures, causing a compile error
• Renames the old 1-arg sweep-debt variant to sweep_fee_debt_to_insurance (what it actually does)
• Updates both call sites in settle_maintenance_fee and settle_maintenance_fee_best_effort_for_crank
• All 54 lib tests pass

Test plan

• cargo test --lib passes
• cargo build-sbf --features mainnet in percolator-prog compiles cleanly

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 7a89f0ed-a3e1-498b-8d46-9dc6a54c5df8

📥 Commits

Reviewing files that changed from the base of the PR and between 9a1c627 and aa109eb.

📒 Files selected for processing (1)

• src/percolator.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch hotfix/dedup-charge-fee

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