[Synthetics] Make overview grid embeddable

[shahzad31]

Summary

Overview grid can be embedded as part of dashboard !!

Can be added by selecting type Select Type -> Synthetics ->

[apmmachine]

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[justinkambic]

Warning: this will likely clash with my efforts on #187092.

If this is a requirement that is ok but it should also ideally address the scalability concerns with larger deployments.

[elasticmachine]

Pinging @elastic/obs-ux-management-team (Team:obs-ux-management)

[dominiqueclarke]

The "group by" feature does not work in the embeddable.

[jasonrhodes]

Did we address @justinkambic's concerns about the scalability work he was doing here, or do we have a plan for that? Thanks!

[kdelemme]

Code LGTM, need to do some smoke test

[kdelemme]

do we want to check isValid?

[kdelemme]

Manual test looks good so far, just noticed the sorting is not taken into account when using a grouping option:
Below i'm sorting by status while grouping by monitor type, but the sort is not applied in the group. I guess that's also not working on the synthetics page itself, so not specific to this PR.

[kdelemme]

Just a note on the sorting with grouping, but i guess that need to be done at the synthetics component level

[kibana-ci]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: 2c8ef46
• Kibana Serverless Image: docker.elastic.co/kibana-ci/kibana-serverless:pr-160597-2c8ef4600308

Failed CI Steps

Metrics [docs]

Module Count

Fewer modules leads to a faster build time

id	before	after	diff
synthetics	978	991	+13

Async chunks

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

id	before	after	diff
synthetics	853.6KB	924.4KB	+70.8KB

Page load bundle

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

id	before	after	diff
synthetics	35.7KB	34.9KB	-902.0B

Unknown metric groups

async chunk count

id	before	after	diff
synthetics	10	14	+4

History

• 💚 Build #227184 succeeded b43db21
• 💚 Build #227113 succeeded bbbe37b
• 💚 Build #226761 succeeded 877de41
• 💔 Build #226469 failed 5e14ed3
• 💛 Build #226434 was flaky 06f7f49

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