[Synthetics] Port enablement API tests to Serverless

[justinkambic]

Summary

Related to #179100.

Sets up Synthetics API Integrations suite in Serverless Tests and adds tests for the enablement endpoint.

Additional API test ports will be posted following up on this in the coming days.

[elasticmachine]

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

[apmmachine]

🤖 GitHub comments

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Just comment with:

• /oblt-deploy : Deploy a Kibana instance using the Observability test environments.
• /oblt-deploy-serverless : Deploy a serverless 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

• Buildkite Build
• Commit: 35a05ed

Metrics [docs]

✅ unchanged

History

• 💚 Build #200853 succeeded 77e4bd7
• 💔 Build #200695 failed 9a11398e9d3699a3415045c0508ba3b880be1bcd
• 💔 Build #200644 failed c4ab6d0c9922f630dbcdc19707d65950544f3e6e
• 💔 Build #200621 failed dc9a47edac410ed3e32c6198f25b696c3fc79c14

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

cc @justinkambic

[cauemarcondes]

LGTM