fix(datasync): correct MisData postScript and query filtering

- Replace placeholder postScript with actual MIS data post-processing:
  1. Sets ObsoleteDate based on BackLevel records
  2. Sets ObsoleteDate for remaining NULL cases
  3. Rebuilds PK_MisData index

- Add massQuery support to SourceConfig for mode-specific queries
- MisData mass sync now uses query without date filter (like legacy)
- EtlPipelineFactory selects massQuery when in mass mode if available
- Remove unnecessary minDtOffset from MisData mass mode config

NEW/src/JdeScoping.DataSync/Configuration/PipelineConfig.cs

@@ -11,7 +11,8 @@ public record PipelineConfig(
 public record SourceConfig(
     string Connection,
     string Query,
-    Dictionary<string, ParameterConfig>? Parameters);
+    Dictionary<string, ParameterConfig>? Parameters,
+    string? MassQuery = null);
 
 public record ParameterConfig(
     string Name,