Examine ExistentialAny

[yo1995]

-enable-upcoming-feature ExistentialAny

Examine the ExistentialAny conformance in the project and add missing any for the protocol types. Most commonly seen,

Use of protocol 'Error' as a type must be written 'any Error'; this will be an error in a future Swift language mode

- @State private var error: Error?
+ @State private var error: (any Error)?