[syntax-errors] Irrefutable case pattern before final case (#16905)

Summary
--

Detects irrefutable `match` cases before the final case using a modified
version
of the existing `Pattern::is_irrefutable` method from the AST crate. The
modified method helps to retrieve a more precise diagnostic range to
match what
Python 3.13 shows in the REPL.

Test Plan
--

New inline tests, as well as some updates to existing tests that had
irrefutable
patterns before the last block.

crates/ruff_python_parser/src/parser/pattern.rs

@@ -488,13 +488,16 @@ impl Parser<'_> {
                         // test_ok match_as_pattern_soft_keyword
                         // match foo:
                         //     case case: ...
+                        // match foo:
                         //     case match: ...
+                        // match foo:
                         //     case type: ...
                         let ident = self.parse_identifier();
 
                         // test_ok match_as_pattern
                         // match foo:
                         //     case foo_bar: ...
+                        // match foo:
                         //     case _: ...
                         Pattern::MatchAs(ast::PatternMatchAs {
                             range: ident.range,