Need to add support for using unsafe static <Type>;

[jcouv]

As part of the PR tightening the compiler enforcement on pointer types (they must always appear in unsafe context after C# 12), this scenario surfaced.
It needs confirmation from LDM and will require a parser change.

Relates to feature "alias any type" (test plan: #56323)

This issue is referenced in tests.

[AlekseyTs]

It looks like there are still references to the issue in tests. Perhaps, scenarios should be adjusted if the feature is supported now.

[AlekseyTs]

@CyrusNajmabadi Just an FYI, I re-activated this issue because it looks like there still some work needed in tests that explicitly reference this issue in comments