[FE 1.0] 2/2 Drop AllowDifferentMembersInActual from compiler and testData

The annotation was dropped in the previous commit

compiler/testData/codegen/box/multiplatform/defaultArguments/bothInExpectAndActual2.kt

@@ -21,8 +21,6 @@ actual interface I {
     actual fun test(source: String = "actual")
 }
 
-@OptIn(ExperimentalMultiplatform::class)
-@AllowDifferentMembersInActual
 actual interface J : I {
     override fun test(source: String) {
         if (source != "actual") throw AssertionError(source)

compiler/testData/codegen/box/multiplatform/hmpp/simple.kt

@@ -25,8 +25,6 @@ fun getB(): B = B()
 
 // MODULE: main()()(intermediate)
 // FILE: main.kt
-@OptIn(ExperimentalMultiplatform::class)
-@AllowDifferentMembersInActual
 actual open class A actual constructor() {
     fun bar(): String = "K"
 }

compiler/testData/codegen/box/multiplatform/k2/basic/expectInterfaceInSupertypes.kt

@@ -18,16 +18,12 @@ class B : A()
 // MODULE: platform()()(common)
 // FILE: platform.kt
 
-@OptIn(ExperimentalMultiplatform::class)
-@AllowDifferentMembersInActual
 actual interface S1 {
     fun o(): S = "O"
     val p: Boolean
         get() = true
 }
 
-@OptIn(ExperimentalMultiplatform::class)
-@AllowDifferentMembersInActual
 actual interface S2 {
     fun k() = "K"
 }

compiler/testData/codegen/box/multiplatform/k2/basic/expectInterfaceInSupertypes2.kt

@@ -19,8 +19,6 @@ class B : A()
 // MODULE: platform()()(common)
 // FILE: platform.kt
 
-@OptIn(ExperimentalMultiplatform::class)
-@AllowDifferentMembersInActual
 actual interface S1 {
     fun s1() = "O"
 }
@@ -29,13 +27,9 @@ interface S20 {
     fun s2() = "K"
 }
 
-@OptIn(ExperimentalMultiplatform::class)
-@AllowDifferentMembersInActual
 actual interface S2 : S20 {
 }
 
-@OptIn(ExperimentalMultiplatform::class)
-@AllowDifferentMembersInActual
 actual interface S : S1, S2 {
     fun s3() = s1() + s2()
 }