[ML] Replaces jQuery's $el.width() with element.clientWidth.

[walterra]

Summary

Gets rid of leftover usage of jQuery. Replaces jQuery $el.width() with element.clientWidth that was used in the Anomaly Explorer chart for rare detectors.

I updated the jest test for the component to return timestamps that result in a reasonable amount of ticks. A jest spy was added to mock clientWidth which is not available via jsdom because it lacks a layout engine.

Checklist

• Unit or functional tests were updated or added to match the most common scenarios
• This was checked for breaking API changes and was labeled appropriately

[elasticmachine]

Pinging @elastic/ml-ui (:ml)

[peteharverson]

LGTM

[darnautov]

LGTM

[darnautov]

nit:

Suggested change

	jest.spyOn(Element.prototype, 'clientWidth', 'get').mockImplementation(() => 500);
	jest.spyOn(Element.prototype, 'clientWidth', 'get').mockReturnValue(500);

[walterra]

Note for for operations/QA team about the review ping: I had to change some files to investigate a problem where jest assertions are not the same on my local machine vs. CI. I will revert the changes once the problem is solved.

[kibana-ci]

💚 Build Succeeded

• Buildkite Build
• Commit: 64a8ed7

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	4.1MB	4.1MB	-83.0B

Page load bundle

Size of the bundles that are downloaded on every page load. Target size is below 100kb

id	before	after	diff
ml	77.3KB	77.2KB	-51.0B

History

• 💔 Build #205014 failed 874ff0f
• 💔 Build #204969 failed 6eed44a
• 💔 Build #204884 failed b4ce602
• 💔 Build #202909 failed b571284
• 💔 Build #202871 failed 10e967e

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

cc @walterra