[3.10] gh-125041: gh-90781: test_zlib: For s390x HW acceleration, skip checking the compressed bytes (GH-125042) (#125585)

gh-125041: gh-90781: test_zlib: For s390x HW acceleration, skip checking the compressed bytes (GH-125042)

This backports two commits:

- GH-31096 skipped the tests unconditionally
- GH-125042 skips only the possibly-failing assertion

(cherry picked from commit cc5a225cdc2a5d4e035dd08d59cef39182c10a6c)