[Search Sessions] Maps embeddable restore doesn't work if screen size has changed

[lizozom]

Search Sessions were integrated into maps embeddable in #89342
And I just noticed a bug with the implementation:

1. Create a dashboard with a map
2. Save a search session from the dashboard
3. Change the size of the browser
4. Restore the session from management

Expected result
The map should be restored

Current result
The map does not restore properly because the geo_bounding_box parameter has changed.

Ideas
I think we could try and fixate the bounding box when creating the restoreState of the dashboard.

[elasticmachine]

Pinging @elastic/kibana-gis (Team:Geo)

[elasticmachine]

Pinging @elastic/kibana-app-services (Team:AppServices)

[nreese]

Chatted with @lizozom and @Dosant about possible solutions. For a short term fix, Maps can round the bounding box up to the nearest tile boundary so that small changes in panel size result in exactly the same query. Longer term fix may involve having the dashboard provide a cached panel size or aspect ratio along with the search session id.

[thomasneirynck]

#91148 introduces a padding which "snaps" the data-fetch to a fixed grid, and should accommodate most use-cases where changes in screen-size occur. Can re-open when users actually run into this in the wild.