test(datasync): add integration tests for BranchDevEtl

Add integration tests for the Branch development ETL pipeline:
- BranchDevEtlTests with tests for pipeline creation and execution
- Tests verify pipeline creates correctly and loads data from cache files
- Added appsettings.json with local connection string and cache directory
- Added necessary packages (Configuration.Json, SqlClient, Dapper)

Tests require local SQL Server and CACHED_DB_FILES directory with
branch.json.zstd to pass; tests silently skip if resources unavailable.

NEW/tests/JdeScoping.DataSync.Tests/appsettings.json

@@ -0,0 +1,8 @@
+{
+  "ConnectionStrings": {
+    "LotFinder": "Server=localhost,1434;Database=ScopingTool;User Id=scopingapp;Password=Sc0ping@pp_Dev#2024;TrustServerCertificate=true"
+  },
+  "DevEtl": {
+    "CacheDirectory": "/Users/dohertj2/Desktop/JdeScopingTool/CACHED_DB_FILES"
+  }
+}