ruff

d3c8ddb1 - [ty] Remove tracking of whether a whole scope is in a `TYPE_CHECKING` block (#24472)

[ty] Remove tracking of whether a whole scope is in a `TYPE_CHECKING` block (#24472) ## Summary It isn't necessary to store this state on `Scope` anymore: we can just iterate up through the scope's parent scopes to see if the given range is contained within any of the ranges those scopes recorded as being inside `if TYPE_CHECKING` blocks. I had intended to also remove the `reachability` field from `Scope`: I think that's also possible, but it's a bit more dubious whether that's a _good_ change or not, so I'm splitting this out into an independent cleanup. ## Test Plan Existing tests