Add regression test for Unicode preservation in IA subject imports #11639
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This PR adds a regression test to assert that Unicode characters in subjects
are preserved during IA imports.
While investigating #11637, I traced Unicode handling through MARC parsing,
edition building, and import validation, and did not find any ASCII
normalization or character stripping on the Open Library side. Adding this
test helps make the issue reproducible and prevents future regressions
without guessing at a fix.
Related: #11637