refactor(datasync): update tests to remove FetcherTypeName

- Remove FetcherTypeName assignments from test fixtures in ScheduleCheckerTests
  and SyncOrchestratorTests
- Remove PrepurgeData and ReIndexData assignments from MassConfig in tests
- Mark FetcherTypeName, PostProcessorTypeName, PrepurgeData, and ReIndexData
  as obsolete with deprecation warnings pointing to pipelines.json
- Change FetcherTypeName from required to optional to allow tests to compile
  without providing the deprecated property

NEW/src/JdeScoping.DataSync/Options/DataSourceConfig.cs

@@ -22,12 +22,16 @@ public class DataSourceConfig
 
     /// <summary>
     /// Name of IDataFetcher implementation type (without generic suffix).
+    /// Deprecated: Will be removed in a future release.
     /// </summary>
-    public required string FetcherTypeName { get; set; }
+    [Obsolete("FetcherTypeName is deprecated and will be removed. Use pipelines.json configuration instead.")]
+    public string? FetcherTypeName { get; set; }
 
     /// <summary>
     /// Optional IPostProcessor implementation type name.
+    /// Deprecated: Will be removed in a future release.
     /// </summary>
+    [Obsolete("PostProcessorTypeName is deprecated and will be removed. Use pipelines.json postScripts instead.")]
     public string? PostProcessorTypeName { get; set; }
 
     /// <summary>
@@ -68,11 +72,15 @@ public class ScheduleConfig
 
     /// <summary>
     /// Whether to truncate the table before syncing (mass updates only).
+    /// Deprecated: Will be removed in a future release.
     /// </summary>
+    [Obsolete("PrepurgeData is deprecated and will be removed. Use pipelines.json syncModes.prePurge instead.")]
     public bool PrepurgeData { get; set; } = false;
 
     /// <summary>
     /// Whether to rebuild indexes after syncing (mass updates only).
+    /// Deprecated: Will be removed in a future release.
     /// </summary>
+    [Obsolete("ReIndexData is deprecated and will be removed. Use pipelines.json syncModes.reIndex instead.")]
     public bool ReIndexData { get; set; } = false;
 }