UI/Assets: Disable undo for tree item buttons

Disables undo for:
* The tree row collapsing - which doesn't make sense to undo, isn't
  supported by the undo system, and just triggers the confirmation
  prompt when closing the file.
* Renaming items - While this may make sense in some cases, users of the
  tree-view API can explicitly do an undo push. For asset catalogs it's
  not supported.

source/blender/editors/interface/tree_view.cc

@@ -246,6 +246,7 @@ void AbstractTreeViewItem::add_collapse_chevron(uiBlock &block) const
       &block, UI_BTYPE_BUT_TOGGLE, 0, icon, 0, 0, UI_UNIT_X, UI_UNIT_Y, nullptr, 0, 0, 0, 0, "");
   /* Note that we're passing the tree-row button here, not the chevron one. */
   UI_but_func_set(but, collapse_chevron_click_fn, nullptr, nullptr);
+  UI_but_flag_disable(but, UI_BUT_UNDO);
 
   /* Check if the query for the button matches the created button. */
   BLI_assert(is_collapse_chevron_but(but));
@@ -313,6 +314,7 @@ void AbstractTreeViewItem::add_rename_button(uiLayout &row)
   /* Gotta be careful with what's passed to the `arg1` here. Any tree data will be freed once the
    * callback is executed. */
   UI_but_func_rename_set(rename_but, AbstractTreeViewItem::rename_button_fn, rename_but);
+  UI_but_flag_disable(rename_but, UI_BUT_UNDO);
 
   const bContext *evil_C = static_cast<bContext *>(block->evil_C);
   ARegion *region = CTX_wm_region(evil_C);