gh-145028: Fix blake2 tests in test_hashlib when it is missing due to configure --without-builtin-hashlib-hashes#145029

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tucif wants to merge 3 commits intopython:mainfrom

tucif:tucif/without_blake2

Commits on Feb 20, 2026

reuse blake2 conditionals in missing places and skip subtest for test_algorithms_available if implementation is not provided
tucif
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only skip on value error specific for blake2 if not in builtins in test_algorithms_available
tucif
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Address reviewer comments
tucif
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