Web console: react to user cancelation immediately

[vogievetsky]

This PR makes the following changes to the console:

• The requests on native queries are now immediately canceled, this is helpful in case a user makes a very large request (without a limit) and needs to cancel the query.
• The "Query history" dialog now avoids and does not show up for multi-stage queries because they already show up in the "Recent query tasks" panel and it is confusing that there are two somewhat-history-like places in the UI for multi-stage queries. Also multi-stage queries are sometimes huge and those overwhelm the localStorage.
• Update DQT to fix a small bug.

[pengz-imply]

LGTM👍 Thanks!