tests: Add check using "go tool dist list"

[dolmen]

Add a check that the generated code is available for all GOARCH listed in go tool dist list.

This test must be in a _test.go file, not in the code generators, as the aim is to be able to detect failures with past or future Go toolchains.

$ go version
go version go1.24.0 darwin/arm64
$ go tool dist list | sed 's!.*/!!' | sort -u
386
amd64
arm
arm64
loong64
mips
mips64
mips64le
mipsle
ppc64
ppc64le
riscv64
s390x
wasm