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Reuse machinery from `tail_expr_drop_order` for `if_let_rescope` Namely, it defines its own `extract_component_with_significant_dtor` which is a bit more accurate than `Ty::has_significant_drop`, since it has a hard-coded list of types from the ecosystem which are opted out of the lint.[^a] Also, since we extract the dtors themselves, adopt the same *label* we use in `tail_expr_drop_order` to point out the destructor impl. This makes it much clear what's actually being dropped, so it should be clearer to know when it's a false positive. This conflicts with #137444, but I will rebase whichever lands first. [^a]: Side-note, it's kinda a shame that now there are two functions that presumably do the same thing. But this isn't my circus, nor are these my monkeys.
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