convert the sql services extension to use yarn (#9891)

* convert the sql services extensions to use yarn

* update

samples/sqlservices/.gitignore

@@ -1,2 +1,3 @@
 node_modules
 *.vsix
+typings/*

samples/sqlservices/README.md

@@ -1,7 +1,7 @@
 This is a sample extension that will show some basic model-backed UI scenarios. The long-term goal is to use SQL Service querying (e.g. see if Agent and other services are running) and visualize in interesting ways. Additional suggestions for improving this sample are welcome.
 
-## Useful development commands
-- Download `sqlops` API typings for local development: `gulp copytypings`
-- Install dependencies: `npm install`
-- Compile: `gulp compile` or `gulp watch` to automatically recompile changes
-- Package: `gulp package`. The packaged .vsix will be placed at `out/sqlservices.vsix`.
+## Run the following commands to produce an extension installation package
+
+- `yarn install` - to install the dependencies
+- `yarn build` - to build the code
+- `vsce package` - to produce an extension installation package

samples/sqlservices/tasks/buildtasks.js

@@ -65,9 +65,7 @@ gulp.task('compile:src', function (done) {
 
 gulp.task('compile:test', function (done) {
 	let srcFiles = [
-		config.paths.project.root + '/test/**/*.ts',
-		config.paths.project.root + '/typings/**/*.ts'
-	];
+		config.paths.project.root + '/test/**/*.ts'];
 
 	return gulp.src(srcFiles)
 		.pipe(srcmap.init())