[3.12] gh-108388: regrtest splits test_asyncio package (GH-108393) #108397
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Currently, test_asyncio package is only splitted into sub-tests when
using command "./python -m test". With this change, it's also
splitted when passing it on the command line:
"./python -m test test_asyncio".
Remove the concept of "STDTESTS". Python is now mature enough to not
have to bother with that anymore. Removing STDTESTS simplify the
code.
(cherry picked from commit 174e9da)
Co-authored-by: Victor Stinner vstinner@python.org