[Security Solution][Alert details] - improving session view experience in expandable flyout

[PhilippeOberti]

WIP - not ready for review

Summary

This PR enhances the user experience of the session view component rendered in the expandable flyout.

Checklist

• 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

[elasticmachine]

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