[FIR] Consider extension receiver type in conflicting members checker

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

@@ -0,0 +1,21 @@
+FILE: sameValueParametersDifferentReceiver.kt
+    public open class A : R|kotlin/Any| {
+        public constructor(): R|A| {
+            super<R|kotlin/Any|>()
+        }
+
+        public final fun R|kotlin/String|.foo(from: R|kotlin/String|, to: R|kotlin/String|): R|kotlin/Int| {
+            ^foo Int(1)
+        }
+
+        public final fun <T> R|T|.foo(from: R|kotlin/String|, to: R|kotlin/String|): R|kotlin/Int| {
+            ^foo Int(1)
+        }
+
+    }
+    public final class B : R|A| {
+        public constructor(): R|B| {
+            super<R|A|>()
+        }
+
+    }

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()