Refactor file handling and add Log.FileRead implementation

Adaptation/FileHandlers/Aggregation/FileRead.cs

@@ -117,43 +117,6 @@ public class FileRead : Shared.FileRead, IFileRead
         return results;
     }
 
-    private static int? GetKeyColumnIndex(string[] columns, string keyColumn)
-    {
-#nullable enable
-        int? result = null;
-        for (int i = 0; i < columns.Length; i++)
-        {
-            if (columns[i] != keyColumn)
-                continue;
-            result = i;
-            break;
-        }
-        return result;
-    }
-
-    private ReadOnlyCollection<string> GetSystemStateValues(List<string> lines, string[] columns, int keyColumnIndex)
-    {
-        List<string> results = new();
-        string[] values;
-        string? systemState;
-        string keyColumnValue;
-        for (int i = 7; i < lines.Count; i++)
-        {
-            values = lines[i].Split('\t');
-            if (values.Length != columns.Length)
-                continue;
-            keyColumnValue = values[keyColumnIndex];
-            if (string.IsNullOrEmpty(keyColumnValue))
-                continue;
-            if (!_SystemStateToNames.TryGetValue(keyColumnValue, out systemState))
-                continue;
-            if (results.Contains(systemState))
-                continue;
-            results.Add(systemState);
-        }
-        return new(results);
-    }
-
     private Tuple<string, Test[], JsonElement[], List<FileInfo>> GetExtractResult(string reportFullPath, DateTime _)
     {
         Tuple<string, Test[], JsonElement[], List<FileInfo>> results;