refactor: ErrorSection의 buttons 네이밍 변경 및 요소에 key 추가

- buttons -> buttonList

frontend/src/components/error/ErrorSection/index.tsx

@@ -13,16 +13,18 @@ interface ErrorSectionProps {
 }
 
 const ErrorSection = ({ errorMessage, handleReload, handleGoHome }: ErrorSectionProps) => {
-  const buttons = [
+  const buttonList = [
     {
       buttonType: 'primary' as ButtonType,
+      key: 'refreshButton',
       text: '새로고침하기',
       image: ReloadIcon,
       imageDescription: '새로고침 이미지',
       onClick: handleReload,
     },
     {
       buttonType: 'secondary' as ButtonType,
+      key: 'homeButton',
       text: '홈으로 이동하기',
       image: HomeIcon,
       imageDescription: '홈 이미지',
@@ -37,9 +39,9 @@ const ErrorSection = ({ errorMessage, handleReload, handleGoHome }: ErrorSection
       </S.ErrorLogoWrapper>
       <S.ErrorMessage>{errorMessage}</S.ErrorMessage>
       <S.Container>
-        {buttons.map((button) => (
+        {buttonList.map((button) => (
           <Button
-            key={button.text}
+            key={button.key}
             buttonType={button.buttonType}
             text={button.text}
             image={button.image}