[Infra + Logs UI] New Kibana platform migration plan

[skh]

The new Kibana platform migration requires us to do a few things in advance, so that we can prepare for a smooth transition to the "new way of doing things" for the Kibana platform. Overall this plan is outlined in the migration guide, and this ticket will track the work required to get there for the Infra and Logs UIs.

TODO in separate tickets:

• List all of the places we import from ui/* or any other "magical webpack import", so we can replace those with dependency-injection or other solutions.
• Implement core shim #39080

Open questions

Server

• makeTSVBRequest() in server/lib/adapters/framework/kibana_framework_adapter.ts uses server.inject() to call the TSVB API. Check if that's ok.

Client

[elasticmachine]

Pinging @elastic/infrastructure-ui

[elasticmachine]

Pinging @elastic/infra-logs-ui

[jasonrhodes]

Closing this in favor of tracking issues at a meta level across all o11y: #39797