Add CI log-size regression checks with verbosity 4 and per-test/node thresholds

[Copilot]

This updates .ci network test scripts to actively catch logfile growth regressions. Tests now run at --verbosity 4 and enforce configurable logfile size caps per test and node type.

• Shared log validation (.ci/utils.sh)

  • Extended check_logs with optional size-limit parameters:
    • max_validator_log_size_bytes
    • max_client_log_size_bytes
  • Added hard-fail checks when a node logfile exceeds its configured bound.
  • Corrected the validator iteration condition in check_logs so validator logs are actually checked.

• Per-test size bounds + verbosity 4

  • Updated scripts to run nodes with verbosity 4 and pass explicit size bounds into check_logs:
    • .ci/test_devnet.sh (validator + client bounds)
    • .ci/test_full_upgrade.sh (validator + client bounds)
    • .ci/test_partial_upgrade.sh (validator bound)
    • .ci/test_db_backup.sh (validator bound)
    • .ci/test_reset_minority.sh (validator bound)
    • .ci/test_restart_majority.sh (validator bound)

• Usage pattern

  check_logs "$log_dir" "$total_validators" "$total_clients" "$max_warnings" \
    "$MAX_VALIDATOR_LOG_SIZE_BYTES" "$MAX_CLIENT_LOG_SIZE_BYTES"