tests/run-multitests.py: Support outputting test metrics.

If a multitest calls `multitest.output_metric(...)` then that output will
be collected separately, not considered as part of the test verification
output, and instead be printed at the end.  This is useful for tests that
want to output performance/timing metrics that may change from one run to
the next.

Signed-off-by: Damien George <damien@micropython.org>

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