Move `Microsoft.Build.Sql` version to global.json (#5810)

global.json

@@ -4,6 +4,7 @@
     "rollForward": "latestFeature"
   },
   "msbuild-sdks": {
-    "Microsoft.Build.Traversal": "4.1.0"
+    "Microsoft.Build.Traversal": "4.1.0",
+    "Microsoft.Build.Sql": "0.1.9-preview"
   }
 }

src/Sql/Sql.sqlproj

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project DefaultTargets="Build">
-  <Sdk Name="Microsoft.Build.Sql" Version="0.1.9-preview" />
+  <Sdk Name="Microsoft.Build.Sql"/>
   <PropertyGroup>
     <Name>Sql</Name>
     <ProjectGuid>{58554e52-fdec-4832-aff9-302b01e08dca}</ProjectGuid>