Add function name ignore filter for argument-always-wildcard

[nevumx]

So, regarding https://docs.styra.com/regal/rules/bugs/argument-always-wildcard, (and constant-condition) I can see the rationale, but this is actually a common pattern for mocking functions for unit tests like so:

mock_failure_two_args(_, _) if {
	false # regal ignore:constant-condition <-- This rule too
}

# elsewhere...

test_some_func_fails if {
	not allow with input as some_input with some_two_arg_func as mock_failure_two_args
}

Pretty simple to ignore, but also could use an ignore pattern for function names.

See https://styracommunity.slack.com/archives/C05HF2KRY3G/p1721235767450349?thread_ts=1721235252.149699&cid=C05HF2KRY3G