FIR initializer: don't report type mismatch on incompatible extensions

This commit suppresses type mismatch error from KT-45989

compiler/testData/diagnostics/tests/annotations/annotationOnParameterInFunctionType.fir.kt

@@ -24,6 +24,6 @@ class A : (@Ann Int)->Unit {
 @Target(AnnotationTarget.TYPE)
 annotation class TypeAnn
 
-val onType: (@TypeAnn A).(@Ann a: @TypeAnn A, @TypeAnn A)->@TypeAnn A? = <!INITIALIZER_TYPE_MISMATCH!>{ null }<!>
+val onType: (@TypeAnn A).(@Ann a: @TypeAnn A, @TypeAnn A)->@TypeAnn A? = { null }
 
 fun (@TypeAnn A).extFun(@Ann a: @TypeAnn A): @TypeAnn A? = null

compiler/testData/diagnostics/tests/functionAsExpression/FunctionType.fir.kt

@@ -28,5 +28,5 @@ fun testReceiverType() {
 
     val bas: String.() -> Unit = fun String.() {}
 
-    val bag: Int.() -> Unit = <!INITIALIZER_TYPE_MISMATCH!>fun String.() {}<!>
+    val bag: Int.() -> Unit = fun String.() {}
 }

compiler/testData/diagnostics/tests/functionLiterals/missedTypeMismatch.fir.kt

@@ -23,7 +23,7 @@ fun main() {
     foo(fun(): String = <!ARGUMENT_TYPE_MISMATCH!>"1"<!>)
     foo(((fun(): String = <!ARGUMENT_TYPE_MISMATCH!>"1"<!>)))
 
-    val a10: Int.(String) -> Int = <!INITIALIZER_TYPE_MISMATCH!>fun (x: String) = 10<!>
+    val a10: Int.(String) -> Int = fun (x: String) = 10
     val a11: () -> () -> () -> Int = fun() = fun() = fun(): String = "1"
 
     val a12: Int = <!INITIALIZER_TYPE_MISMATCH!>fun(): String = "1"<!>

compiler/testData/diagnostics/tests/inference/completion/postponedArgumentsAnalysis/basic.fir.kt

@@ -153,7 +153,7 @@ fun main() {
     // Convert to extension lambda is impossible because the lambda parameter types aren't specified explicitly
     select(id(fun String.(x: String) {}), id(fun(x: String, y: String) { }), { x, y -> x })
     select(id(id(fun(x: String, y: String) { }), <!TOO_MANY_ARGUMENTS!>fun String.(x: String) {}<!>), { x, y -> x })
-    val x26: Int.(String) -> Int = <!INITIALIZER_TYPE_MISMATCH!>fun (x: String) = 10<!> // it must be error, see KT-38439
+    val x26: Int.(String) -> Int = fun (x: String) = 10 // it must be error, see KT-38439
     // Receiver must be specified in anonymous function declaration
     val x27: Int.(String) -> Int = id(fun (x: String) = 10)
     select(id<Int.(String) -> Unit> {}, { x: Int, y: String -> x })

compiler/testData/diagnostics/tests/inference/lambdaInValInitializerWithAnonymousFunctions.fir.kt

@@ -5,5 +5,5 @@ val test2f: suspend Any.() -> Unit = fun Any.() {}
 
 // This is a bug in the old inference and should be fixed in new inference
 // see "Fix anonymous function literals handling in type checker" for more details
-val test3f: suspend Any.(Int) -> Int = <!INITIALIZER_TYPE_MISMATCH!>fun (k: Int) = k + 1<!>
-val test4f: SuspendFn = <!INITIALIZER_TYPE_MISMATCH!>fun Any.() {}<!>
+val test3f: suspend Any.(Int) -> Int = fun (k: Int) = k + 1
+val test4f: SuspendFn = fun Any.() {}