Increase JTHarness console output stdout limit?

From the 2021 January Release Retrospective it was noted we were missing Test log console output for some failed tests due to insufficient JTHarness log output: https://github.com/AdoptOpenJDK/TSC/issues/195#issuecomment-764535852

Current value is 100,000

Start by locating the JTHarness console or log-output setting currently limited to 100,000, then review the linked January 2021 release retrospective for the missing-output context. Done means the limit is increased enough for failed-test console logs to be retained; the issue does not specify the target value or file.

Written by the indexing model from the issue text.