MCP-17: add two-pass fee-only and skip-fee replay controls

[aeyakovenko]

Summary

• add MCP two-pass fee primitives in SVM and Bank
• svm::transaction_processor:
  • add TransactionProcessingConfig.skip_fee_collection for second-pass execution without fee re-deduction
  • add collect_fees_only_sanitized_transactions(...) as a dedicated fee-only pass
  • when skip_fee_collection=true, skip fee payer debit and zero fee_details
• runtime::bank:
  • add collect_fees_only_for_transactions(...) wrapper for fee-only pass
  • add load_and_execute_transactions_skip_fee_collection(...) wrapper for second pass
• keep default behavior unchanged by setting skip_fee_collection: false in existing call sites

Testing

• cargo test -p solana-svm --lib test_validate_transaction_fee_payer_skip_fee_collection -- --nocapture
• cargo test -p solana-svm --lib test_collect_fees_only_sanitized_transactions -- --nocapture
• cargo test -p solana-runtime --lib test_filter_program_errors_and_collect_fee_details -- --nocapture

Closes #8