Refactor benchmark data models with placeholder values

frontend/lib/models/benchmark/config.dart

@@ -28,8 +28,9 @@ class Config {
   ///
   /// Returns a new `Config` populated with values from the map.
   factory Config.fromJson(Map<String, dynamic> json) => Config(
-        agentBenchmarkConfigPath: json['agent_benchmark_config_path'] ?? "",
+        agentBenchmarkConfigPath:
-        host: json['host'] ?? "",
+            json['agent_benchmark_config_path'] ?? 'placeholder',
+        host: json['host'] ?? 'https://github.com/Significant-Gravitas/AutoGPT',
       );
 
   /// Converts the `Config` instance to a map.

frontend/lib/models/benchmark/metrics.dart

@@ -46,14 +46,14 @@ class Metrics {
   ///
   /// Returns a new `Metrics` populated with values from the map.
   factory Metrics.fromJson(Map<String, dynamic> json) => Metrics(
-        difficulty: json['difficulty'] ?? "",
+        difficulty: json['difficulty'] ?? 'placeholder',
         success: json['success'],
-        attempted: json['attempted'],
+        attempted: json['attempted'] ?? false,
         successPercentage: (json['success_percentage'] != null)
             ? json['success_percentage'].toDouble()
             : 0.0,
-        cost: json['cost'] ?? "",
+        cost: json['cost'] ?? 'placeholder',
-        runTime: json['run_time'] ?? "",
+        runTime: json['run_time'] ?? 'placeholder',
       );
 
   /// Converts the `Metrics` instance to a map.

frontend/lib/models/benchmark/repository_info.dart

@@ -4,16 +4,16 @@
 /// This class contains essential information like the repository URL, team name, and the Git commit SHA for both the benchmark and the agent.
 class RepositoryInfo {
   /// The URL of the repository where the benchmark code resides.
-  final String repoUrl;
+  String repoUrl;
 
   /// The name of the team responsible for the benchmark.
-  final String teamName;
+  String teamName;
 
   /// The Git commit SHA for the benchmark. This helps in tracing the exact version of the benchmark code.
-  final String benchmarkGitCommitSha;
+  String benchmarkGitCommitSha;
 
   /// The Git commit SHA for the agent. This helps in tracing the exact version of the agent code.
-  final String agentGitCommitSha;
+  String agentGitCommitSha;
 
   /// Constructs a new `RepositoryInfo` instance.
   ///
@@ -34,10 +34,12 @@ class RepositoryInfo {
   ///
   /// Returns a new `RepositoryInfo` populated with values from the map.
   factory RepositoryInfo.fromJson(Map<String, dynamic> json) => RepositoryInfo(
-        repoUrl: json['repo_url'] ?? "",
+        repoUrl: json['repo_url'] ??
-        teamName: json['team_name'] ?? "",
+            'https://github.com/Significant-Gravitas/AutoGPT',
-        benchmarkGitCommitSha: json['benchmark_git_commit_sha'] ?? "",
+        teamName: json['team_name'] ?? 'placeholder',
-        agentGitCommitSha: json['agent_git_commit_sha'] ?? "",
+        benchmarkGitCommitSha:
+            json['benchmark_git_commit_sha'] ?? 'placeholder',
+        agentGitCommitSha: json['agent_git_commit_sha'] ?? 'placeholder',
       );
 
   /// Converts the `RepositoryInfo` instance to a map.

frontend/lib/models/benchmark/run_details.dart

@@ -5,7 +5,7 @@
 /// the time of completion, the time when the benchmark started, and the name of the test.
 class RunDetails {
   /// The unique identifier for the benchmark run, typically a UUID.
-  final String runId;
+  String runId;
 
   /// The command used to initiate the benchmark run.
   final String command;
@@ -40,13 +40,15 @@ class RunDetails {
   ///
   /// Returns a new `RunDetails` populated with values from the map.
   factory RunDetails.fromJson(Map<String, dynamic> json) => RunDetails(
-        runId: json['run_id'] ?? "",
+        runId: json['run_id'] ?? 'placerholder',
-        command: json['command'],
+        command: json['command'] ?? 'placeholder',
         completionTime: json['completion_time'] == null
             ? DateTime.now()
             : DateTime.parse(json['completion_time']),
-        benchmarkStartTime: DateTime.parse(json['benchmark_start_time']),
+        benchmarkStartTime: json['benchmark_start_time'] == null
-        testName: json['test_name'],
+            ? DateTime.now()
+            : DateTime.parse(json['benchmark_start_time']),
+        testName: json['test_name'] ?? 'placeholder',
       );
 
   /// Converts the `RunDetails` instance to a map.

frontend/lib/models/benchmark/task_info.dart

@@ -1,4 +1,6 @@
 // TODO: Remove the ability to have null values when benchmark implementation is complete
+import 'dart:convert';
+
 /// TaskInfo holds information related to a specific benchmark task.
 ///
 /// The class encapsulates various attributes of a task, such as the path to the data file,
@@ -47,12 +49,12 @@ class TaskInfo {
   ///
   /// Returns a new TaskInfo populated with values from the map.
   factory TaskInfo.fromJson(Map<String, dynamic> json) => TaskInfo(
-        dataPath: json['data_path'],
+        dataPath: json['data_path'] ?? 'placeholder',
         isRegression: json['is_regression'] ?? false,
         category: List<String>.from(json['category']),
-        task: json['task'],
+        task: json['task'] ?? 'placeholder',
-        answer: json['answer'],
+        answer: json['answer'] ?? 'placeholder',
-        description: json['description'],
+        description: json['description'] ?? 'placeholder',
       );
 
   /// Converts the TaskInfo instance to a map.
@@ -61,7 +63,8 @@ class TaskInfo {
   Map<String, dynamic> toJson() => {
         'data_path': dataPath,
         'is_regression': isRegression,
-        'category': category,
+        // 'category': jsonEncode(category),
+        'category': "[\"coding\"]",
         'task': task,
         'answer': answer,
         'description': description,