Disable prompt to open in existing workspace or new window if folder is already open

If a user has a folder open in their workspace and generated a new MP Starter project into the same folder, we should not prompt to open the folder in the current workspace or a new folder, since it will already show up in their existing folder.

The following prompt should instead read "MicroProfile Starter project generated." without the options to open the project.

Start by locating the code that displays the post-generation prompt in this VS Code extension. Reproduce generation into a folder already open in the workspace, then verify that the prompt is replaced with “MicroProfile Starter project generated.” and no open-project options are shown.

Written by the indexing model from the issue text.