[v10.1.x] BrowseDashboards: Only remember the most recent expanded folder #74809
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Backport 5cb7eb5 from #74617
What is this feature?
The old Browse Dashboards UI remembers opened folders and automatically loads their children when Browse or Search is opened. If the user has opened many folders, this can saturate the requests the frontend makes and prevents new requests (such as one for the user's search) from completing quickly.
This PR changers the old Browse Dashboards UI to only remember the last folder opened.
Why do we need this feature?
So the old Browse Dashboards UI performance does not get worse the more someone uses it.
Who is this feature for?
Everyone who isn't using new Browse Dashboards UI
Which issue(s) does this PR fix?:
Fixes #59543
Special notes for your reviewer:
Becuase this is in the old UI which we no longer dog food, we must manually test this throughly.
This is intended to be backported.