inference failure when broadcasting over multiple structs and a Field

## Describe the bug
Reproducer added in #2062
Initially found in https://github.com/CliMA/ClimaLand.jl/pull/739

This is a type inference error that arises when a function is broadcast over one field and two structs that both have `broadcastable` extended using `tuple`. The types in the expression become too complex, and inference fails. The problem is simplified in the reproducer so the structs each contain one scalar value, and the called function itself does nothing. The reproducer was tested on fields constructed on multiple different spaces, and reproduced the bug on all of them.