[GHAR][LBT] log error to console
[GHAR][LBT] log error to console

When the land-blocking test fails to process the JSON report, log the
error to the runner console.

Closes: #2904
Approved by: ankushagarwal

aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core,libra/libra,libra/libra,aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core,libra/libra,libra/libra,libra/libra