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gh-90473: Skip and document more failing tests on WASI (GH-93436)

- Mark more ``umask()`` cases
- ``dup()`` is not supported
- ``/dev/null`` is not available
- document missing features
- mark more modules as not available
(cherry picked from commit 069c96f84ccd302436be180c8628289cc0efa977)

Co-authored-by: Christian Heimes <christian@python.org>
M
Miss Islington (bot) committed
1d2b766100e1807d5fb7df858776a755644ed41b
Parent: e798f69
Committed by GitHub <noreply@github.com> on 6/3/2022, 6:50:44 AM