[ML] Hide job messages clear notifications tooltip on click

[peteharverson]

Summary

Fixes the onClick behavior of the 'Clear notificaitons' and Refresh buttons in the Job Messages tab of the Anomaly Detection jobs list, to hide the tooltip when the button is clicked.

The fix switches the blurButtonOnClick function to use event.currentTarget rather than event.target as currentTarget always refers to the element to which the event handler has been attached, as opposed to target which identifies the element on which the event occurred and which may be its descendant (as was the case for the Clear Notifications button where the event occured on the <span> element containing the button text.

Before:

After:

Checklist

• This was checked for cross-browser compatibility

Fixes #128734

[elasticmachine]

Pinging @elastic/ml-ui (:ml)

[kibana-ci]

💚 Build Succeeded

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• Commit: 39809ad
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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
ml	3.3MB	3.3MB	+71.0B

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

cc @peteharverson

[jgowdyelastic]

LGTM

[alvarezmelissa87]

LGTM ⚡

[kibanamachine]

💚 All backports created successfully

Status	Branch	Result
✅	8.3

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