Fix freeze on room switch (#7884)

* Fix freeze on room switch

updateServerCandidates was called on every room member event and
not throttled.

Fixes https://github.com/vector-im/element-web/issues/21127

* Move import

* Disable throttling in tests

* Types

Co-authored-by: Travis Ralston <travisr@matrix.org>

Co-authored-by: Travis Ralston <travisr@matrix.org>

test/utils/permalinks/Permalinks-test.js

@@ -122,7 +122,7 @@ describe('Permalinks', function() {
             },
             member95,
         ]);
-        const creator = new RoomPermalinkCreator(room);
+        const creator = new RoomPermalinkCreator(room, null, false);
         creator.load();
         expect(creator._serverCandidates[0]).toBe("pl_95");
         member95.membership = "left";