Stabilize UI tests

This PR uses delays in order to get the "YAML custom tags works as expected"
test passing consistently.

My best guess as to why this works is that it takes bit of time
for the setting change to propagate to the language server.

Fixes #1119

Signed-off-by: David Thompson <davthomp@redhat.com>

Author: datho7561

test/ui-test/customTagsTest.ts

@@ -43,6 +43,7 @@ export function customTagsTest(): void {
         await textSettingsEditor.typeTextAt(coor[0], coor[1], '    "customTag1"');
       }
       await textSettingsEditor.save();
+      await hardDelay(1_000);
 
       editor = (await editorView.openEditor(yamlFileName)) as TextEditor;
       await editor.setText('custom');