Remove Token::is_trivia method (#11962)

Sorry, a leftover from my rebase

crates/ruff_python_parser/src/token.rs

@@ -43,12 +43,6 @@ impl Token {
         (self.kind, self.range)
     }
 
-    /// Returns `true` if this is a trivia token.
-    #[inline]
-    pub const fn is_trivia(self) -> bool {
-        matches!(self.kind, TokenKind::Comment | TokenKind::NonLogicalNewline)
-    }
-
     /// Returns `true` if the current token is a triple-quoted string of any kind.
     ///
     /// # Panics