Deprecate the `expr_method_call` function entirely in favour of ufc

[oli-obk]

Using method calls in built in derives keeps causing problems due to different imports in the surrounding scope.

Maybe we should just remove the expr_method_call function entirely (or perma-deprecate it so ppl searching for it get an explanation of why they should use ufcs)

Originally posted by @oli-obk in #81294 (comment)

[Skgland]

expr_method_call has been removed in 441dc36