[Vislib] Use timestamp on brush event instead of iso dates

[stratoula]

Summary

Closes #90923.
Url drilldowns on brush event for all visualizations emit timestamps instead of the vislib xy axis that emit ISO strings. We want to change this behavior and emit timestamps instead in order to be in line with the rest.

Url drilldowns are in beta and introduced on 7.10 so we are not going to proceed with migrating the existing URL templates.

How to test it

Create a URL drilldown (range) and add the following URL template
{{kibanaUrl}}/app/discover#/?_g=(filters:!(),refreshInterval:(pause:!t,value:0),time:(from:'{{date event.from}}',to:'{{date event.to}}'))&_a=(columns:!(_source),filters:{{rison context.panel.filters}},index:'{{context.panel.indexPatternId}}',interval:auto,query:(language:{{context.panel.query.language}},query:'{{context.panel.query.query}}'),sort:!())

It should work correctly now with the date function

[elasticmachine]

Pinging @elastic/kibana-app (Team:KibanaApp)

[Dosant]

Looks good.

Could you please also tweak the docs 🙏
I think it makes sense to tweak as part of this:

https://github.com/elastic/kibana/blob/master/docs/user/dashboard/url-drilldown.asciidoc

from and to values of selected range. Depending on your data, could be either a date or number.

---> to probably something like:

from and to values of the selected range as numbers

There is also a functional test that should have caught this "regression", could you please tweak an assertion so we would catch it? Probably we need also to check that time range in discover is not now-15min

https://github.com/elastic/kibana/blob/master/x-pack/test/functional/apps/dashboard/drilldowns/dashboard_to_url_drilldown.ts#L76

[stratoula]

@elasticmachine merge upstream

[ppisljar]

code LGTM

[Dosant]

Thanks for the docs and test changes 🚀

[kibanamachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: 5e8eac8
• Documentation Changes

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
visTypeVislib	622.9KB	623.1KB	+186.0B

History

• 💚 Build #107181 succeeded 6630313
• 💚 Build #106810 succeeded 208c416

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

[mbondyra]

Code LGTM, tested on Chrome, all works wonderfully with the example drilldown:

{{kibanaUrl}}/app/discover#/?_g=(filters:!(),refreshInterval:(pause:!t,value:0),time:(from:'{{date event.from}}',to:'{{date event.to}}'))&_a=(columns:!(_source),filters:{{rison context.panel.filters}},index:'{{context.panel.indexPatternId}}',interval:auto,query:(language:{{context.panel.query.language}},query:'{{context.panel.query.query}}'),sort:!())