Rollup merge of #142570 - jieyouxu:disunion, r=estebank

Reject union default field values

Fixes rust-lang/rust#142555.

The [`default_field_values` RFC][rfc] does not specify that default field values may be used on `union`s, and it's not clear how default field values may be used with `union`s without an design extension to the RFC. So, for now, reject trying to use default field values with `union`s.

### Review notes

- The first commit adds the `union` with default field values test case to `tests/ui/structs/default-field-values/failures.rs`, where `union`s with default field values are currently accepted.
- The second commit rejects trying to supply default field values to `union` definitions.
- When `default_field_values` feature gate is disabled, we show the feature gate error when the user tries to write `union`s with default field values. When the feature gate is enabled, we reject this usage with
   > unions cannot have default field values

``@rustbot`` label: +F-default_field_values

[rfc]: https://rust-lang.github.io/rfcs/3681-default-field-values.html

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