[ty] Respect property deleters in attribute deletion checks (#24500)
## Summary
This PR adds support for deleter properties, so we now error on the
following:
```python
class ReadOnlyProperty:
@property
def x(self) -> int:
return 1
read_only = ReadOnlyProperty()
# error: [invalid-assignment] "Cannot delete read-only property `x` on object of type `ReadOnlyProperty`"
del read_only.x
```
While this looks like a lot of code, it ends up being a fairly
mechanical change -- almost every line corresponds to a similar line for
setters and/or getters, with the exception of
`validate_attribute_deletion`.
ruff
90fd7dd8 - [ty] Respect property deleters in attribute deletion checks (#24500)
