chore: update some error messages for clarity

[jeffreyssmith2nd]

Which issue does this PR close?

Closes #10915.

Rationale for this change

The changes in #10651 lead to a change in the error messages given when a function is called without any arguments. I think it can be made a little clearer to the user what actually went wrong, the error message as of this PR vs main can be seen below.

The new error message as of this PR:

"Error during planning: Error during planning: SUM does not support zero arguments. No function matches the given name and argument types 'SUM()'. You might need to add explicit type casts.\n\tCandidate functions:\n\tSUM(UserDefine
d)"

The current error message in main:

"Error during planning: Error during planning: [data_types_with_aggregate_udf] Coercion from [] to the signature VariadicAny failed. and No function matches the given name and argument types 'selector_last()'. You might need to add explicit type casts.\n\tCandidate functions:\n\tselector_last(Any, .., Any)"

What changes are included in this PR?

A few error messages are updated to provide users with a bit more context.

Are these changes tested?

Are there any user-facing changes?

[alamb]

Looks like a nice improvement to me. Thank you @jeffreyssmith2nd

cc @jayzhan211

[jayzhan211]

Thanks @jeffreyssmith2nd and @alamb