[issue36268] Change default tar format to modern POSIX 2001 (pax) for better portability/interop, support and standards conformance

[C.A.M. Gerlach]

C.A.M. Gerlach <CAM.Gerlach at Gerlach.CAM> added the comment:

PR is up with CI checks green as [GH-12355](https://github.com/python/cpython/pull/12355). I also had to fix one test which implicitly assumed that DEFAULT_FORMAT == GNU_FORMAT.

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<https://bugs.python.org/issue36268>
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