Add tests for error_handlers modul

[mayank0030]

Adds unit tests for the safety.error_handlers module covering:

• output_exception() — verifies message is printed in red to stderr, exits with correct code, and respects exit_code_output=False
• handle_cmd_exception() decorator — verifies SafetyError is caught and passed to output_exception, generic Exception is wrapped in SafetyException, click.ClickException is re-raised, and successful functions return normally

Tests: 7/7 passing

Ref #573

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