Tests: parse program logs and tx batching

[RedaRahmani]

Summary of Changes

This PR adds unit tests around two critical behaviors:

• validator-debt: tests parse_program_logs so we correctly mark payments as failed when line 5 contains “Merkle leaf” or “Insufficient funds”, and succeed otherwise (including short/None logs).

• solana-client-tools: tests transaction batching to ensure no instructions are dropped, order is preserved, batches fit Solana packet size, and a CU-limit instruction is added (with correct CU math in the single-batch case). Also uses PACKET_DATA_SIZE for the size limit helper.