fix(openai): reask functionality broken in JSON mode since v1.9.0 (#1793)

Since v1.9.0, from this PR:
#1549, the reask
functionality with JSON mode is broken.

Irrespective of whether the underlying error is a `JSONDecodeError` or
`ValidationError`, both are being wrapped under
`instructor.core.exceptions.ValidationError`

Hence in `retry_sync`/`retry_async` of `instructor/core/retry.py`, these
wrapped errors are always caught by the generic `Exception` block
instead of the specific `(ValidationError, JSONDecodeError)` block, even
when those specific exception types should trigger retries with error
messages included
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----

> [!IMPORTANT]
> Fixes reask functionality in JSON mode by removing exception wrapping
in `_validate_model_from_json()` to allow specific exception handling.
> 
>   - **Behavior**:
> - Fixes reask functionality in JSON mode by removing exception
wrapping in `_validate_model_from_json()` in `function_calls.py`.
> - Allows `JSONDecodeError` and `ValidationError` to be caught
specifically in `retry_sync`/`retry_async` in `retry.py`.
>   - **Exceptions**:
> - Removes wrapping of exceptions in
`instructor.core.exceptions.ValidationError` in
`_validate_model_from_json()`.
>   - **Logging**:
> - Retains debug logging for JSON decode and model validation errors in
`_validate_model_from_json()`.
> 
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Author: jxnl

instructor/processing/function_calls.py

@@ -95,12 +95,7 @@ def _validate_model_from_json(
         raise ValueError(f"Failed to parse JSON: {e}") from e
     except Exception as e:
         logger.debug(f"Model validation error: {e}")
-        # Re-raise with more context
-        from ..core.exceptions import ValidationError as InstructorValidationError
-
-        raise InstructorValidationError(
-            f"Failed to validate model {cls.__name__}: {str(e)}"
-        ) from e
+        raise
 
 
 class OpenAISchema(BaseModel):