[DataGrid] Position PanelFilter popover manually

[michelengelen]

          Ok, I've spent some time debugging the issue. looking at this example https://codesandbox.io/s/panel-anchor-forked-k52pdr?file=/Demo.tsx if you open the `GridPanel` by clicking either button, then close it by `Esc` or clicking away and then open it again by clicking the other button then it works. 

@woodreamz I would suggest that you implement a custom button to first close all open panels using the apiRef and then open it again. In that scenario it should work as expected - it's a workaround. Let us know if this works. If not we would try and prioritize the issue and look at how the anchorEl is set internally. I checked it quickly and at first glance, it looks like the GridPanel was set's it to be the column header. https://github.com/mui/mui-x/blob/next/packages/grid/x-data-grid/src/components/panel/GridPanel.tsx#L101

I apologize for not picking up your problem sooner but as @romgrk explained we had more pressing things to work on and the issue you have raised is not a critical problem that we had to fix quickly. We always respond in time to provide clarity on when the issue will potentially be fixed. In that particular case, we failed to set the expectations which is on us.

Originally posted by @DanailH in #10415 (comment)

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