fix: Allow reuse of Pydantic models in BAML schema generation #8828
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Description
Addresses issue #8715
The BAML adapter previously disallowed re-use of a BaseModel in a schema, incorrectly classifying all such cases as recursion.
Changes
Modified
_build_simplified_schema
to only track models during active traversal using try/finally to ensure cleanup after traversalAdded test for this situation