language_test: allow more characters in the log before truncating #16213
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We initially introduced this limit for log messages in #16117. However I've since realized that these log messages also include useful stacktraces (when the program being tested throws an exception), which are a bit longer.
The intention here is really to avoid really long messages, so increase the maximum message size a little to still avoid those, but allow us to see more of the stacktrace that should hopefully be useful for debugging.
The number is mostly still based on a guesstimate of what's useful, but it's easy to tweak if we need to tweak it further.