Matthias Krüger a99209738e
Rollup merge of #111991 - BoxyUwU:change_error_term_display, r=compiler-errors
Change ty and const error's pretty printing to be in braces

`[const error]` and `[type error]` are slightly confusing since they look like either a slice with an error type for the element ty or a slice with a const argument as the type ???. This PR changes them to display as `{const error}` and `{type error}`  similar to `{integer}`.

This does not update the `Debug` impls for them which is done in #111988.

I updated some error logic to avoid printing the substs of trait refs when unable to resolve an assoc item for them, this avoids emitting errors with `{type error}` in them. The substs are not relevant for these errors since we don't take into account the substs when resolving the assoc item.

r? ``@compiler-errors``
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