openpyxl: Class attributes set explicitly as another class' #10549
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Has overlap with #9511, so should reduce changes there.
I searched the openpyxl source code for instances of a class attribute being explicitly set as another class'.
In most cases, those will be descriptors, which pyright will have issues with re-assigning. Luckily, they'll also mostly refer to parent definitions. For typing purposes, this can be simplified to just not including them. I still left them in as comments to make it a bit more explicit.
Similarly, mypy has issues with re-assigning properties (see python/mypy#13975 / python/mypy#6700) so I explicitly redefined those when they came from a non-parent class.