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ruff/crates/ty_python_semantic
David Peter f76d3f87cf [ty] Allow declared-only class-level attributes to be accessed on the class (#19071)
## Summary

Allow declared-only class-level attributes to be accessed on the class:
```py
class C:
    attr: int

C.attr  # this is now allowed
``` 

closes https://github.com/astral-sh/ty/issues/384
closes https://github.com/astral-sh/ty/issues/553

## Ecosystem analysis


* We see many removed `unresolved-attribute` false-positives for code
that makes use of sqlalchemy, as expected (see changes for `prefect`)
* We see many removed `call-non-callable` false-positives for uses of
`pytest.skip` and similar, as expected
* Most new diagnostics seem to be related to cases like the following,
where we previously inferred `int` for `Derived().x`, but now we infer
`int | None`. I think this should be a
conflicting-declarations/bad-override error anyway? The new behavior may
even be preferred here?
  ```py
  class Base:
      x: int | None
  
  
  class Derived(Base):
      def __init__(self):
          self.x: int = 1
  ```
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