Use fully qualified names for attributes defined in source generated files

[sdargaud]

Is your feature request related to a problem? Please describe.
The attributes, like BindableDerivedListAttribute, defined in the source generated files, derive from Attribute.
Since our solution already defines an Attribute class (I know, this is bad practice, but we can't change that unfortunately), and is used with global usings, it generates the following error:
'Attribute' is an ambiguous reference between 'MyApp.Attribute' and 'System.Attribute'

Describe the solution you'd like
Would it be possible to use global::System.Attribute instead?

Describe alternatives you've considered
I considered removing the global usings but it would mean changing hundreds of files.

[glennawatson]

Makes sense to change. Thanks for the bug report.

[github-actions]

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