CORE-1936 Update data selection drawer zIndex to modal

The data selection drawer zIndex was less than the zIndex for dialogs
in mui v5, so this fixes it so that it's no longer hidden behind
data move or copy metadata dialogs.

Also fixed a warning about an elevation with the outlined variant.

src/components/data/SelectionDrawer.js

@@ -337,10 +337,12 @@ function SelectionDrawer(props) {
             onClose={onClose}
             open={open}
             anchor="right"
+            elevation={0}
             PaperProps={{
                 variant: "outlined",
                 classes: { root: classes.selectionDrawer },
             }}
+            sx={{ zIndex: "modal" }}
         >
             <div
                 style={{