Use Go 1.22 unalias

[StevenACoffman]

Go 1.22 Added types.Unalias per https://tip.golang.org/doc/go1.22

However, when #3226 and then #3246 was added, we added a variety of Go 1.23-only build-tagged code that we were supposed to remove when we dropped support for Go 1.22. However, types.Unalias should never have been Go 1.23 only. Go 1.23 Added generic type aliases which is a different thing than Go 1.9's type aliases.

In Go 1.9+ you can have a type alias:

type Alias = someType

but Go in 1.23 we can also declare type parameters with the alias declaration:

type Alias[P1 C1, P2 C2] = someType

Importantly, Go 1.18 introduced any as a type alias for interface{}, and we want to encourage the use of any. Since any is a type alias of interface{} it is causing some confusion (and non-repeatable results) when we do not use types.Unalias in Go 1.22.

From Alias names

Go 1.9 introduced the notion of a type alias. A type alias provides a new name for an existing type without introducing a new type that has a different identity.

In contrast to a regular type definition

type T T0

which declares a new type that is never identical to the type on the right-hand side of the declaration, an alias declaration

type A = T  // the "=" indicates an alias declaration

declares only a new name A for the type on the right-hand side: here, A and T denote the same and thus identical type T.

[coveralls]

coverage: 73.855% (-0.06%) from 73.915%
when pulling a7e6470 on unalias_go122
into 6d7a5d9 on master.

[StevenACoffman]

@UnAfraid @a8m @giautm @evellior Possibly fixes #3414