build_log_processor now always summarizing output to stderr
build_log_processor now always summarizing output to stderr

The main purpose of build_log_processor is to summarize the output and send the result to stderr. This way callers don't need to remember to pass -Pandroidx.summarizeStderr .

Otherwise, running build_log_processor without -Pandroidx.summarizeStderr will just redirect all of the output to stdout, leaving stderr empty

Bug: 236269677
Test: Run `OUT_DIR=out ./development/build_log_processor.sh bash -c "echo sample error && exit 1" >/dev/null` and see that the output is nonempty

Test: ./gradlew :help # and see that it still shows the fancy status console

Test: ./gradlew :misspelled # and see that it doesn't try to run build_log_simplifier

Test: ./gradlew :misspelled -Pandroidx.summarizeStderr # and see that it does run build_log_simplifier

Test: Treehugger runs busytown/*.sh

Change-Id: I53acfe830b48f99fd1fc37d6c5afb612349fdf86

androidx/androidx,AndroidX/androidx,androidx/androidx,AndroidX/androidx,AndroidX/androidx,AndroidX/androidx,AndroidX/androidx,AndroidX/androidx,AndroidX/androidx,AndroidX/androidx,AndroidX/androidx,androidx/androidx,androidx/androidx,androidx/androidx,androidx/androidx,AndroidX/androidx,androidx/androidx,androidx/androidx,androidx/androidx,androidx/androidx