refactor(datasync): remove deprecated SyncMode and SyncModeConfig

- Delete SyncMode.cs enum file
- Remove SyncModes property from PipelineConfig
- Remove SyncModeConfig and DestinationOverride records
- Remove WithMode(SyncMode) from IEtlPipelineBuilder
- Remove BuildWithSyncModes() and related methods from EtlPipelineFactory
- Remove syncModes sections from all pipelines in pipelines.json
- Update tests to use schedules-only configuration

All pipelines now require 'schedules' format (mass/daily/hourly).
WithUpdateType(UpdateTypes) is the only way to set update type.

NEW/tests/JdeScoping.DataSync.Tests/Configuration/PipelinesRootTests.cs

@@ -72,14 +72,13 @@ public class PipelinesRootTests
     {
         var config = new PipelineConfig(
             new SourceConfig("jde", "SELECT 1", null, null),
-            null, // Old SyncModes - deprecated
             new PipelineSchedules
             {
                 Mass = new ScheduleConfig { PrePurge = true, ReIndex = true },
                 Daily = new ScheduleConfig { Enabled = true },
                 Hourly = new ScheduleConfig { Enabled = false }
             },
-            null,
+            null, // Transformers
             new DestinationConfig("TestTable", ["Id"], null),
             null,
             null);
@@ -93,12 +92,12 @@ public class PipelinesRootTests
     {
         return new PipelineConfig(
             new SourceConfig("lotfinder", "SELECT 1", null, null),
-            new Dictionary<string, SyncModeConfig>
+            new PipelineSchedules
             {
-                ["mass"] = new SyncModeConfig(null, true, true),
-                ["incremental"] = new SyncModeConfig("-1d")
+                Mass = new ScheduleConfig { PrePurge = true, ReIndex = true },
+                Daily = new ScheduleConfig(),
+                Hourly = new ScheduleConfig()
             },
-            null, // Schedules
             null, // Transformers
             new DestinationConfig("TestTable", ["Id"], null),
             null,