[3.11] gh-110918: Fix side effects of regrtest test_match_tests() (GH-116718) #116727
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test_match_tests now saves and restores patterns.
Add get_match_tests() function to libregrtest.filter.
Previously, running test_regrtest multiple times in a row only ran
tests once: "./python -m test test_regrtest -R 3:3.
(cherry picked from commit 612f1ec)
Co-authored-by: Victor Stinner vstinner@python.org