[FIR] Consider extension receiver type in conflicting members checker

compiler/fir/analysis-tests/testData/resolve/overrides/sameValueParametersDifferentReceiver.kt

@@ -0,0 +1,11 @@
+open class A {
+    fun String.foo(from: String, to: String): Int {
+        return 1
+    }
+
+    fun <T> T.foo(from: String, to: String): Int {
+        return 1
+    }
+}
+
+class B : A()