[ty] Avoid inferring types for invalid binary expressions in string annotations (#21911)

## Summary

Closes https://github.com/astral-sh/ty/issues/1847.

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Co-authored-by: David Peter <mail@david-peter.de>

crates/ty_python_semantic/resources/mdtest/annotations/string.md

@@ -156,6 +156,9 @@ a: "1 or 2"
 b: "(x := 1)"
 # error: [invalid-type-form]
 c: "1 + 2"
+# Regression test for https://github.com/astral-sh/ty/issues/1847
+# error: [invalid-type-form]
+c2: "a*(i for i in [])"
 d: "lambda x: x"
 e: "x if True else y"
 f: "{'a': 1, 'b': 2}"