Add a button in the console to cancel the currently running query

While it is possible to open a separate browser tab, query `sys.jobs` and issue a `kill` command, it would be really handy to have a button directly in the console to cancel the currently running query.

Related with https://github.com/crate/crate-admin/issues/675

Start in the console query flow and trace how the running query relates to the sys.jobs query and kill command described in the issue. Compare the related crate-admin issue 675 for context; done means the console exposes a button that cancels the currently running query.

Written by the indexing model from the issue text.