TreeTable has operations applied to it immediately before close

[niloc132]

While fixing deephaven/deephaven-core#6067 I found that it appears IrisGridModelUpdater is applying sort, filter, viewport, then closing the current rollup to replace it with a new one.

Steps to reproduce:

1. Check out 6067-treetable-race from github.com/niloc132/deephaven-core. This branch has extra logging turned on
2. Create a table, such as

   from deephaven import empty_table
   t = empty_table(1000).update(["X=i%2", "Y=i%5", "Z=i"])

3. Open the menu at the upper right, select Rollup
4. Double-click X, then double-click Y
5. With the browser console open, remove X

Expected: log should show that the old rollup is closed, new rollup happens, sorts/filters are applied

Actual: old rollup is filtered, sorted, subscribed, then closed, and then a new rollup is created, sorted/filters, subscribed.

In this example log, 17 is the old rollup table being closed, and 18 is the new one being created.

The "TreeTable already closed" lines can be ignored, they're a side effect of closing while operations are pending. Likewise the application of the same filter/sort repeatedly should have no effect and shouldn't re-create the subscription, but that'll be fixed with the rest of 6067.