discover query cancellation

[ppisljar]

Summary

adds cancel button to discover search bar

Part of #175426

Checklist

Delete any items that are not applicable to this PR.

• Any text added follows EUI's writing guidelines, uses sentence case text and includes i18n support
• Unit or functional tests were updated or added to match the most common scenarios
• Flaky Test Runner was used on any tests changed
• Any UI touched in this PR is usable by keyboard only (learn more about keyboard accessibility)
• Any UI touched in this PR does not create any new axe failures (run axe in browser: FF, Chrome)
• This renders correctly on smaller devices using a responsive layout. (You can test this in your browser)
• This was checked for cross-browser compatibility

[elasticmachine]

Pinging @elastic/kibana-data-discovery (Team:DataDiscovery)

[ppisljar]

/ci

[davismcphee]

The changes look good to me overall, but I still think a functional test would be valuable here. I looked into it today and managed to write one that I think does a decent job of testing this functionality. Opened a PR against your branch here: ppisljar#13.

I also opened up a separate PR against main to verify that this PR should still pass if we merge the test in: #176779.

[kibana-ci]

💚 Build Succeeded

• Buildkite Build
• Commit: 44d869d

Metrics [docs]

Async chunks

Total size of all lazy-loaded chunks that will be downloaded as the user navigates the app

id	before	after	diff
discover	573.6KB	574.1KB	+458.0B

History

• 💚 Build #192820 succeeded f4cffac

To update your PR or re-run it, just comment with:
@elasticmachine merge upstream

[davismcphee]

Thanks for the work on this and merging in the functional test! LGTM 👍