cogl tests: Show the actual output from tests if VERBOSE is setwip/smcv/cogl-show-test-output

Writing tests' output to a log file makes them difficult to debug when
the test might be running on an autobuilder or CI system where only
stdout/stderr are recorded. This is particularly troublesome if a
failure is only reproducible on a particular autobuilder.

Recent Automake versions have the convention that detailed output from
failing tests is written to stdout/stderr, not just to log files, when
the VERBOSE environment variable is set; borrow that convention as a
trigger for producing detailed test output.

This was originally cogl!14, but applies equally to mutter's fork of cogl.

https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1273

Signed-off-by: Simon McVittie <smcv@debian.org>

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