Fix return type for dataclass callable type (PY-28442)

python/testData/inspections/PyTypeCheckerInspection/DataclassClsCallType/a.py

@@ -0,0 +1,11 @@
+from dataclasses import dataclass
+
+
+@dataclass
+class Point:
+    x: int
+    y: int
+
+    @classmethod
+    def from_str(cls, string: str) -> 'Point':
+        return cls(1, 2)

python/testData/inspections/PyTypeCheckerInspection/DataclassClsCallType/dataclasses.py

@@ -0,0 +1,3 @@
+def dataclass(_cls=None, *, init=True, repr=True, eq=True, order=False,
+              unsafe_hash=False, frozen=False):
+    pass