feat: unify string insert text for array and property (#934)

Author: p-spacek

src/languageservice/services/yamlCompletion.ts

@@ -1205,7 +1205,7 @@ export class YamlCompletion {
         insertText = `\${${insertIndex++}:0}`;
         break;
       case 'string':
-        insertText = `\${${insertIndex++}:""}`;
+        insertText = `\${${insertIndex++}}`;
         break;
       case 'object':
         {

test/autoCompletion.test.ts

@@ -1047,7 +1047,7 @@ describe('Auto Completion Tests', () => {
         const completion = parseSetup(content, content.lastIndexOf('Ba') + 2); // pos: 3+2
         completion
           .then(function (result) {
-            assert.strictEqual('fooBar:\n  - ${1:""}', result.items[0].insertText);
+            assert.strictEqual('fooBar:\n  - ${1}', result.items[0].insertText);
           })
           .then(done, done);
       });

test/autoCompletionFix.test.ts

@@ -482,7 +482,7 @@ objB:
 
     expect(completion.items.length).equal(1);
     expect(completion.items[0]).to.be.deep.equal(
-      createExpectedCompletion('objectWithArray', 'objectWithArray:\n    - ${1:""}', 1, 4, 1, 4, 10, 2, {
+      createExpectedCompletion('objectWithArray', 'objectWithArray:\n    - ${1}', 1, 4, 1, 4, 10, 2, {
         documentation: '',
       })
     );