fix: Cherry-pick #2540: Pass optional expandDescendants arg to setColumnExpanded#2576

vbabich merged 2 commits intodeephaven:release/v0.85deephaven/web-client-ui:release/v0.85from

vbabich:fix-missing-arg-in-toggleExpandColumnvbabich/web-client-ui:fix-missing-arg-in-toggleExpandColumnCopy head branch name to clipboard