gh-109566: Run buildbot tests with --fail-rerun

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• Issue: Unify ways to run the Python test suite #109566

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Since tests are now re-run in fresh processes, it's more likely that they pass when being re-run in verbose mode.

IMO we should make tests fail if a test failed and then succeeded when re-run: we should not silence tests failing randomly.

See also: https://discuss.python.org/t/consider-downgrading-windows-32-bit-from-tier-1-to-tier-2-or-tier-3-in-python-3-13/33719/37

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Hum, the two GHA Windows jobs run directly PCbuild\rt.bat, instead of Tools\buildbot\test.bat. I moved the two --fail options in rt.bat, so the GHA Windows jobs use them.