Onboarding integration flow fleet

[angorayc]

Summary

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Checklist

Check the PR satisfies following conditions.

Reviewers should verify this PR satisfies this list as well.

• [ ] Any text added follows EUI's writing guidelines, uses sentence case text and includes i18n support
• [ ] Documentation was added for features that require explanation or tutorials
• [ ] Unit or functional tests were updated or added to match the most common scenarios
• [ ] If a plugin configuration key changed, check if it needs to be allowlisted in the cloud and added to the docker list
• [ ] This was checked for breaking HTTP API changes, and any breaking changes have been approved by the breaking-change committee. The release_note:breaking label should be applied in these situations.
• [ ] Flaky Test Runner was used on any tests changed
• [ ] The PR description includes the appropriate Release Notes section, and the correct release_note:* label is applied per the guidelines

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[elasticmachine]

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