Check extension receiver properly for property references

Without this, the unrelated type specified on the LHS of a property reference
literal was considered to be an extension receiver of the candidate, and the
resolution was erroneously successul. This is only reproducible for properties,
because if we're trying to resolve an extension, we consider all properties
from the scope, even non-extensions, because there may be a property of an
extension-functional type (T.() -> R). (We don't do this for functions.)

 #KT-7430 Fixed
 #KT-7945 Fixed

compiler/testData/diagnostics/tests/callableReference/kt7430_wrongClassOnLHS.txt

@@ -0,0 +1,17 @@
+package
+
+internal final class Test {
+    public constructor Test(/*0*/ name: kotlin.String = ...)
+    internal final val name: kotlin.String
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    internal final fun foo(): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+internal final class Unrelated {
+    public constructor Unrelated()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}