Migrate sample data installer off of the saved objects APIs

[TinaHeiligers]

Related to #149287
Installing sample data uses the Saved Objects APIs.
We need to audit the implementation and migrate off of deprecated APIs before they are removed.

Migration options:

1. Use public domain specific APIs
2. Rely only on import/export
3. something else

[elasticmachine]

Pinging @elastic/kibana-core (Team:Core)

[TinaHeiligers]

Initial audit:

1. run kibana, install sample data and record deprecation logs related to Saved Objects
2. audit the code for deprecations
3. document which (if any) deprecated APIs are used
4. discuss migration options

[rudolf]

As far as I can tell the only usage is https://github.com/elastic/kibana/blob/main/src/plugins/home/public/application/components/home_app.js#L64

This could probably be ported to use the import saved objects API

[elasticmachine]

Pinging @elastic/appex-sharedux (Team:SharedUX)

[Dosant]

@TinaHeiligers, @rudolf thanks for taking a look. We will look into this, but I wonder if this is needed for 9.0 and should be tracked together with other 9.0 blocking items?

[rudolf]

We are no longer removing saved object APIs from 9.0 and so this is more general cleanup work than a 9.0 blocker.