Don't say that a `yield` statement in an annotation scope in a function is "not in a function"

[ntBre]

I think there is still something here. With

def _():
# error: [invalid-type-form] "`yield` expressions are not allowed in type expressions"
# error: [invalid-syntax] "yield expression cannot be used within a TypeVar bound"
    type X[T: (yield 1)] = int

def _():
# error: [invalid-type-form] "`yield` expressions are not allowed in type expressions"
# error: [invalid-syntax] "yield expression cannot be used within a type alias"
    type Y = (yield 1)

I still get the outside of a function errors

semantic_syntax_errors.md - Semantic syntax error diagnostics - Invalid expression

  crates/ty_python_semantic/resources/mdtest/diagnostics/semantic_syntax_errors.md:304 unexpected error: 16 [invalid-syntax] "`yield` statement outside of a function"
  crates/ty_python_semantic/resources/mdtest/diagnostics/semantic_syntax_errors.md:309 unexpected error: 15 [invalid-syntax] "`yield` statement outside of a function"

Originally posted by @maxmynter in astral-sh/ruff#17748 (comment)

[ntBre]

In case someone wants to get to this before me, I think you'll just need to update this function to look more like in_await_allowed_context a few lines above it. And that's called here in case it turns out to be more involved than that.

[maxmynter]

Having stumbled upon this, I would love to take a jab at it :)

[maxmynter]

PR ready in the Ruff repository: astral-sh/ruff#18008