[Discover] Add ad-hoc data views to saved searches

[kertal]

When #138283 is done, it is possible to create an ad hoc data view in Discover, but there are still several actions that require a persisted data view. Users should be enabled to save an ad hoc data view with a saved search.

While the basic code to enable saving the save search with the ad hoc one should be straight forward (don't show the dialog), the following task need to be checked

• When loading a saved search with an add hoc data view it should be selected in the data view picker

• Make sure ad-hoc contained saved search work like normal ones (except for actions where the users have to confirm to persist)

  • Discover incl. surrounding docs + single doc view should work
  • Saved searches on dashboard should work
  • Metric based Visualizations currently display "Search not found" - this has to be investigated, depending on the effort it might make sense to not allow creating such visualizations with ad-hoc data views, and fix it in a follow up PR

• Once a saved search is duplicated (saved as a new saved search), the add hoc data view's id should get a new id

• For features that currently don't work with an ad-hoc data view, and therefore the user has to confirm to create a "normal" data view, the id of the "normal" data view has to be a new one

• There shall be functional tests, also for using such enhanced saved searches on dashboards

[elasticmachine]

Pinging @elastic/kibana-data-discovery (Team:DataDiscovery)

[dimaanj]

Closing, since resolved by #138283