Problem:
After commit f02d7e7e33
the `tree-sitter test` command no longer printed the final test summary,
leaving empty line. The `Stats` struct was embedded into `TestSummary`,
and the explicit call to print it was removed.
Solution:
Print `parse_stats` from `TestSummary.fmt()` implementation.
(cherry picked from commit 17e3c7a5c5)