[Synthetics UI] update sync service endpoints

[shahzad31]

Summary

Closes #147629.

Use the new endpoints in the synthetics service, notably:

• Use /monitors/sync to sync the monitors from Kibana.

[elasticmachine]

Pinging @elastic/uptime (Team:uptime)

[apmmachine]

🤖 GitHub comments

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Just comment with:

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

[kibana-ci]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: 51ecb60

Failed CI Steps

• Synthetics @elastic/synthetics Tests

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
synthetics	1.2MB	1.2MB	+24.0B

Unknown metric groups

ESLint disabled line counts

id	before	after	diff
securitySolution	432	435	+3

Total ESLint disabled count

id	before	after	diff
securitySolution	512	515	+3

History

• 💔 Build #120321 failed 861893a

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

[awahab07]

LGTM!