[Tech Debt] [Infra O11y UI] remove uses of deprecated EUI page with new components introduced in 63.0.0

[matschaffer]

Description:

Remove usages of EUI *_deprecated components for Page template components and replace them with new page template.

Background:

See this PR for reference: #139524 and #139524 (comment) for a rough migration overview.

From it:

Main EuiPageTemplate release changelog

This component has been replaced (in EUI) with a new flexible namespaced component that utilizes React context to pass through top level props and a new sectioning component that makes it easier to stack page contents including headers in any order.

👉 New component docs: https://elastic.github.io/eui/#/templates/page-template
👉 EUI PR with details: elastic/eui#5768
👉 Guidelines: https://elastic.github.io/eui/#/templates/page-template/guidelines

In addition, the latest update deprecates a lot of (now defunct) page components like EuiPageContent and renames then with _Deprecated. This will hopefully alert owners that they should be switching to the latest template paradigm.

[elasticmachine]

Pinging @elastic/infra-monitoring-ui (Team:Infra Monitoring UI)

[roshan-elastic]

Closing for the moment as @matschaffer has left.

We need to understand the benefit of doing this in more detail before we can have this on the backlog. For example:

• Which page does this affect?
• What benefits will we gain?

[roshan-elastic]

@weltenwort - Apologies, I can see this affects Logs UI too...feel free to re-open if you think this is a priority for Logs UI.