[syntax-errors] Alternative match patterns bind different names (#20682)

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## Summary

<!-- What's the purpose of the change? What does it do, and why? -->
This PR implements semantic syntax error where alternative patterns bind
different names

## Test Plan

<!-- How was it tested? -->
I have written inline tests as directed in #17412

---------

Signed-off-by: 11happy <soni5happy@gmail.com>
Co-authored-by: Brent Westbrook <brentrwestbrook@gmail.com>

crates/ty_python_semantic/resources/mdtest/import/star.md

@@ -194,7 +194,7 @@ match get_object():
         ...
     case I(foo=R):
         ...
-    case P | Q:
+    case P | Q:  # error: [invalid-syntax] "alternative patterns bind different names"
         ...
 
 match 56:
@@ -292,7 +292,9 @@ match 42:
         ...
     case [D]:
         ...
-    case E | F:  # error: [invalid-syntax] "name capture `E` makes remaining patterns unreachable"
+    # error: [invalid-syntax] "name capture `E` makes remaining patterns unreachable"
+    # error: [invalid-syntax] "alternative patterns bind different names"
+    case E | F:
         ...
     case object(foo=G):
         ...
@@ -360,7 +362,9 @@ match 42:
         ...
     case [D]:
         ...
-    case E | F:  # error: [invalid-syntax] "name capture `E` makes remaining patterns unreachable"
+    # error: [invalid-syntax] "name capture `E` makes remaining patterns unreachable"
+    # error: [invalid-syntax] "alternative patterns bind different names"
+    case E | F:
         ...
     case object(foo=G):
         ...