Create new slos plugin

[mgiota]

Fixes #176420

[apmmachine]

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• /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!)

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[mgiota]

Closing this PR in favor of #177937. observability plugin was moved under observability_solution folder as part of this PR and there were many conflicts in the initial PR.