* feat: Allow variables to be defined outside a Component
Fixes#4315
Modify `prepare_global_scope` function in `src/backend/base/langflow/utils/validate.py` to evaluate classes, functions, and variables defined outside the Component's class.
* **Function Changes:**
- Add evaluation of external classes using `ast.ClassDef`.
- Add evaluation of external functions using `ast.FunctionDef`.
- Add evaluation of external variables using `ast.Assign`.
* **Unit Tests:**
- Add tests in `src/backend/tests/unit/test_validate_code.py` to verify the evaluation of external classes, functions, and variables.
- Include tests for multiple external classes and external variables and functions.
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* [autofix.ci] apply automated fixes
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