UI for proactively canceling long-running queries

[lukasolson]

We automatically cancel in-progress queries when the search results are discarded (e.g. navigating away from the page, refreshing, submitting a new query, etc.).

However, it would also be nice if we had a UI for proactively cancelling queries that are taking a long time:

We also need to think about what will happen in Discover, Visualize, and Dashboard when a user has cancelled the query. (Do we show an error message, or an empty chart?)

What still needs to be done -

• Make run beyond timeout disabled in OSS
• Remove the async search actions from the plugin API (use setSearchInterceptor instead)
• Re-build the UI component Add async search notification #60706
• Implement info level notifications Add addInfo toast to core notifications service #60574
• Canceled embeddable indication
• Support feature controls

[elasticmachine]

Pinging @elastic/kibana-app

[elasticmachine]

Pinging @elastic/kibana-app-arch

[lukasolson]

Closed by #60706.