[Maps] [Dashboard] Unsaved Changes Showing After Cancel

[ThomThomson]

Kibana version: 7.12

Describe the bug:
On a dashboard with at least one map panel, if the user navigates to any editor and back again, (without adding anything) the unsaved changes badge will show, and there will be unsaved changes registered for that dashboard on the listing page.

Steps to reproduce:

1. Open a dashboard with at least one map panel
2. Navigate to any editor like Lens or Visualize
3. Click the cancel button or the the browser back button

Expected behavior:
Canceling out of an editor or navigating back should only show unsaved changes if there are actually unsaved changes.

Any additional context:
Looks like the diff is finding differences in the embeddableConfig of the map panel. Some of the information may be getting lost on subsequent loads?

What's interesting is that this doesn't result in any visible changes on the map. The zoom stays as configured etc.

Last Saved Map Panel State:

Current Map Panel State:

[elasticmachine]

Pinging @elastic/kibana-presentation (Team:Presentation)

[elasticmachine]

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

[ThomThomson]

While #98180 is still a problem, the specific issue raised here, where the map buffer causes unsaved changes sometimes, the issue isn't present anymore after simply going to an editor and back. Closing this, but will leave the other issue open.