Remove custom property from nb and cell metadata #207995
Merged
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For #205637
custom
property was required at one point in time in the VS Code API.Any data associated with the custom property was considered metadata coming from extensions, and rest was reserved for VS Code.
However this is no longer the case, all metadata added into nb or cells is now considered custom.
I.e. all VS Code specific metadata is hidden behind know properties or not accessible to 3rd party extensions.