1. Clicking on query history menu items when nothing is selected. Error
   message is clearer. It would be better to disable when nothing is
   selected, but waiting on
   microsoft/vscode#99767 to be released.
2. Trying to run query with a missing or invalid qlpack has better
   message.
3. Better hover text for "Open query".

Co-authored-by: Aditya Sharad <6874315+adityasharad@users.noreply.github.com>