Do not require that unsafe fields lack drop glue

Instead, we adopt the position that introducing an `unsafe` field
itself carries a safety invariant: that if you assign an invariant
to that field weaker than what the field's destructor requires,
you must ensure that field is in a droppable state in your
destructor.

See:
- https://github.com/rust-lang/rfcs/pull/3458#discussion_r1971676100
- https://rust-lang.zulipchat.com/#narrow/channel/213817-t-lang/topic/unsafe.20fields.20RFC/near/502113897

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