[data grid] Remove dead logic to support Safari < 13 #13249
Merged
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Since MUI X v7 is supposed to have the same browser support as Material UI v6 mui/material-ui#40958. So support Safari >= 15.4. I'm removing code that is well supposed in that range: https://caniuse.com/css-touch-action.
Less code, faster parse time, faster rendering.
I saw this from working on #13248.