Add main controller tests for a few extensions (#11307)

* add a few tests

* fix errors

* undo change

* move registering commands to extension.ts for dacpac and schema compare

* undo createController() addition

* fix whitespace

extensions/sql-database-projects/coverConfig.json

@@ -4,7 +4,8 @@
 	"relativeCoverageDir": "../../coverage",
 	"ignorePatterns": [
 		"**/node_modules/**",
-		"**/test/**"
+		"**/test/**",
+		"extension.js"
 	],
 	"reports": [
 		"cobertura",