Please show TOP of build log in console output - even when trimming

The current console log pre-truncates for large output. That's good/expected/useful. 

However, it forces you to display the whole log - just to get useful information from the top of the log. Namely - the build agent and checkout/prep details. 

Please consider changing (or providing option to change) the console log output to show the first X lines of output, then the ellipsis, then the last Y lines, instead of ONLY showing the last Y lines.