`A2-3-1`:  Reports `StringLiteral`s incorrectly

### Affected rules
 - `A2-3-1`

### Description

This rule has an exception:
> It is permitted to use other characters inside the text of a wide string and a UTF-8 encoded string literal.

This rule is currently implemented as two queries, one of which covers the `StringLiteral` case and reports all string literals. We should exclude `L".."` an `u8".."` strings.