Improve tags that shown in the marketplace entry

Now that the extension is in the marketplace,
https://marketplace.visualstudio.com/items?itemName=Esri.appstudio-vscode
unexpected tags are visible for it. Currently they are:
- keybindings
- qml
- syslog-output

Its not immediately clear where these are coming from. Research required.

Start with the linked Visual Studio Code Marketplace entry and compare its displayed tags with the extension's published metadata. Trace where keybindings, qml, and syslog-output are supplied; done means the unintended tags are removed and the marketplace listing shows only intended tags.

Written by the indexing model from the issue text.