Add the unexpected token to the error message (#3430)

* Add the unexpected token to the error message

This is helpful during development where there's nothing to point at
the character index.

* Update more tests

src/lang/abstractSyntaxTree.test.ts

@@ -2026,7 +2026,7 @@ describe('parsing errors', () => {
     expect(result).toBeInstanceOf(KCLError)
     const error = result as KCLError
     expect(error.kind).toBe('syntax')
-    expect(error.msg).toBe('Unexpected token')
+    expect(error.msg).toBe('Unexpected token: (')
     expect(error.sourceRanges).toEqual([[27, 28]])
   })
 })