[Dashboard] Fix add panels order of items !!

[shahzad31]

Summary

Fixes part of #190853 !!

Combines synthetics and SLO embeddables under common observability group !!

After

Before

[obltmachine]

🤖 GitHub comments

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Just comment with:

• /oblt-deploy : Deploy a Kibana instance using the Observability test environments.
• run docs-build : Re-trigger the docs validation. (use unformatted text in the comment!)

[elasticmachine]

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

[dominiqueclarke]

LGTM

[kibana-ci]

💚 Build Succeeded

• Buildkite Build
• Commit: 84b4248
• Kibana Serverless Image: docker.elastic.co/kibana-ci/kibana-serverless:pr-192082-84b42488c334

Metrics [docs]

Module Count

Fewer modules leads to a faster build time

id	before	after	diff
observabilityShared	205	206	+1
slo	840	839	-1
total			-0

Public APIs missing comments

Total count of every public API that lacks a comment. Target amount is 0. Run node scripts/build_api_docs --plugin [yourplugin] --stats comments for more detailed information.

id	before	after	diff
observabilityShared	451	452	+1

Async chunks

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

id	before	after	diff
slo	852.2KB	852.1KB	-41.0B
synthetics	938.8KB	938.9KB	+62.0B
total			+21.0B

Page load bundle

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

id	before	after	diff
observabilityShared	69.2KB	69.5KB	+260.0B
synthetics	37.0KB	36.8KB	-211.0B
total			+49.0B

Unknown metric groups

API count

id	before	after	diff
observabilityShared	456	457	+1

History

• 💔 Build #231963 failed 08e24d8
• 💔 Build #231946 failed 36bd2e4

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

[mgiota]

LGTM!