9144: Extend convert_tuple_struct_to_named_struct to also apply to enum tuple variants r=matklad a=joshuawarner32
This is largely copied and adapted from the existing `convert_tuple_struct_to_named_struct` code.
Not sure if maybe some of this code can/should be shared between those two assists - but the differences are significant enough to make it at least seem like a non-trivial refactor.
Co-authored-by: Joshua Warner <joshuawarner32@gmail.com>
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