Fix: Update ContestEntry type to include rank and adjust assessment workspace leaderboard ranking logic

Author: tohyzhong

src/commons/assessment/AssessmentTypes.ts

@@ -194,6 +194,7 @@ export type ContestEntry = {
   score?: number;
   final_score?: number;
   student_name?: string;
+  rank?: number;
 };
 
 export type ContestEntryCodeAnswer = {

src/commons/sideContent/content/SideContentContestLeaderboard.tsx

@@ -83,7 +83,7 @@ const SideContentContestLeaderboard: React.FC<SideContentContestLeaderboardProps
               key={contestEntry.submission_id}
               handleContestEntryClick={handleContestEntryClick}
               contestEntry={contestEntry}
-              rank={index + 1}
+              rank={contestEntry.rank ?? 1}
             />
           ))
         ) : (