[3.9] [3.10] bpo-45502: Fix test_shelve (GH-29003) (GH-29305) #29306
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Run test_shelve with all underlying dbm implementations and pickle protocols.
Also make test_shelve discoverable.
(cherry picked from commit b781cc3).
(cherry picked from commit 6b86702)
https://bugs.python.org/issue45502