Inspector (N changes) indicator propagates upwards

[RedMser]

Fixes #78568

Sums up the number of "revertable properties" from all child sections recursively, and shows the same (N changes) marker as if it was change directly in the same section. Does not go across sub-resource boundaries for now.

[Mickeon]

I would hold off propagating this through subresources, at least, not at the moment.
Not sure how the PR currently handles the following scenario, but it would be a nuisance when the same Resource (with its default values changed) is reused in multiple parts.
Ideally it should only propagate when the subresource is used once, but that would feel "magical" and inconsistent on the outside.

[RedMser]

Added additional logic that skips propagating out of sub-inspectors.

[Mickeon]

Oh, so subresources being caught into the propagation were an unintentional consequence. I see.

[KoBeWi]

The proposal was edited. Is it still resolved by this PR?
(the new content)

[RedMser]

Ah, as it stands it just sums up the number of "revertable properties" from all child sections recursively, and shows the same (N changes) marker as if it was change directly in the same section. So yeah, doesn't seem like it closes the proposal.

[Mickeon]

Current PR's behavior is a fairly safe bet for now, should've been like this a long while ago.

[akien-mga]

Thanks!