Updated test expectation to match the new validation that accepts
EITHER range OR columns for Google Sheets append operation. This
fixes the CI test failure.
Test was expecting old message: 'Range is required for append operation'
Now expects: 'Range or columns mapping is required for append operation'
Related to #304 - Google Sheets v4+ resourceMapper validation
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Co-Authored-By: Claude <noreply@anthropic.com>