Schema Compare tests addition (#5136)

* initial tests for schema compare

* Adding schema compare integration test

* Adding code to fix some build issues

* DB compare test

* Adding some CR comments

* db creation and deletion as per CR comments

build/gulpfile.hygiene.js

@@ -155,7 +155,8 @@ const copyrightFilter = [
 	'!extensions/mssql/src/prompts/**',
 	'!extensions/notebook/resources/jupyter_config/**',
 	'!**/*.gif',
-	'!**/*.xlf'
+	'!**/*.xlf',
+	'!**/*.dacpac'
 ];
 
 const eslintFilter = [