remove metaclass check for protected access in properties (#9966)

1. it was incorrect when the property wasn't inside a class and the
   enclosing class didn't have an explicit metaclass

2. The conjugated test is full with errors and I can't understand the
   intention. (the errors: `MC` doesn't inherit `type`; `_nargs` isn't
   defined; `obj` isn't defined, etc). What is the pointed of testing
   protected access on an undefined variable?..

(See full discussions on the MR for reasoning)

Author: temyurchenko

pylint/checkers/classes/class_checker.py

@@ -470,13 +470,8 @@ def _is_attribute_property(name: str, klass: nodes.ClassDef) -> bool:
             inferred
         ):
             return True
-        if inferred.pytype() != property_name:
-            continue
-
-        cls = node_frame_class(inferred)
-        if cls == klass.declared_metaclass():
-            continue
-        return True
+        if inferred.pytype() == property_name:
+            return True
     return False
 
 

tests/functional/p/protected_access.py

@@ -19,18 +19,6 @@ def __init__(self):
 OBJ._teta  # [protected-access]
 
 
-# Make sure protect-access doesn't raise an exception Uninferable attributes
-class MC:
-    @property
-    def nargs(self):
-        return 1 if self._nargs else 2
-
-
-class Application(metaclass=MC):
-    def __no_special__(cls):
-        nargs = obj._nargs  # [protected-access]
-
-
 class Light:
     @property
     def _light_internal(self) -> None:

tests/functional/p/protected_access.txt

@@ -1,4 +1,3 @@
 protected-access:19:0:19:9::Access to a protected member _teta of a client class:UNDEFINED
-protected-access:31:16:31:26:Application.__no_special__:Access to a protected member _nargs of a client class:UNDEFINED
-protected-access:41:14:41:35:Light.func:Access to a protected member _light_internal of a client class:UNDEFINED
-protected-access:45:10:45:31:func:Access to a protected member _light_internal of a client class:UNDEFINED
+protected-access:29:14:29:35:Light.func:Access to a protected member _light_internal of a client class:UNDEFINED
+protected-access:33:10:33:31:func:Access to a protected member _light_internal of a client class:UNDEFINED