Inconsistent use of picker title

[bpasero]

Testing microsoft/vscode#186222

This picker seems to be the only one from the ones I tested that show a title:

[joyceerhl]

This follows our quickpick guidance that multi-step pickers should use a title: microsoft/vscode#158895 (comment)

[bhavyaus]

I'll create an ask for the extension authors to revisit their quick pick experience.