This method allows custom contexts to pick the behavior they want when
a class contains getters/setters that do not have a matching field,
making enhancement impossible.
Three behaviors are available:
* SKIP (the default), which will skip enhancement of such classes.
* FAIL, which will throw an exception upon encountering such classes.
* LEGACY, which will restore the pre-HHH-16572 behavior.
I do not think LEGACY is useful at the moment, but I wanted to have
that option in case it turns out HHH-16572 does more harm than good in
Quarkus 3.15.
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