tests/run-tests.py: Factor out helper function to create test report.

This commit factors existing code in `run-tests.py` into a new helper
function `create_test_report()`.  That function prints out a summary of the
test run (eg number of tests passed, number failed, number skipped) and
creates the corresponding `_results.json` file.

This is done so `create_test_report()` can be reused by the other test
runners.

The `test_count` counter is now gone, and instead the number of passed plus
number of failed tests is used as an equivalent count.

For consistency this commit makes a minor change to the printed output of
`run-tests.py`: instead of printing a shorthand name for tests that failed
or skipped, it now prints the full name.  Eg what was previously printed as
`attrtuple2` is now printed as `basics/attrtuple2.py`.  This makes the
output a little longer (when there are failed/skipped tests) but helps to
disambiguate the test name, eg which directory it's in.

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

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