fix(Datagrid): add disabled/locked col drag functionality back

[matthewgallo]

Contributes to #3455

Adds back the functionality to:

1. Prevent dragging of columns that are disabled
2. Prevent items to be dropped/reordered to positions that are disabled

What did you change?

packages/ibm-products/src/components/Datagrid/Datagrid/DraggableElement.js
packages/ibm-products/src/components/Datagrid/Datagrid/addons/CustomizeColumns/DraggableItemsList.js
packages/ibm-products/src/components/Datagrid/Extensions/ColumnCustomization/ColumnCustomization.stories.js

How did you test and verify your work?

Storybook

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[elycheea]

Oooh, thanks for fixing this. So this implementing still allows us to drag to the position of a locked column but prevents the reordering from updating? I think ideally, we should prevent dropping into the locked column position, but understand if that’s not possible with dnd-kit now. 🤔

[elycheea]

Opened a separate issue for improving the interaction so I think this is ready to go. 🎉