[FIR] Fix effective visibility calculation & relevant test data

compiler/testData/diagnostics/tests/imports/ImportPrivateMembersWithStar.fir.kt

@@ -16,7 +16,7 @@ private class TopLevelClass {
     }
 }
 
-private enum class TopLevelEnum(private val e: NestedEnum) {
+<!EXPOSED_FUNCTION_RETURN_TYPE, EXPOSED_FUNCTION_RETURN_TYPE!>private enum class TopLevelEnum(private val e: NestedEnum) {
     E1(NestedEntry);
 
     private enum class NestedEnum {

compiler/testData/diagnostics/tests/imports/ImportProtectedClass.fir.kt

@@ -7,7 +7,7 @@ open class Foo {
 }
 
 class Bar: Foo() {
-    protected fun foo(): Nested? = null
+    <!EXPOSED_FUNCTION_RETURN_TYPE!>protected fun foo(): Nested? = null<!>
 }
 
 private fun foo(): Nested? = null

compiler/testData/diagnostics/tests/imports/InaccessiblePrivateClass.fir.kt

@@ -14,5 +14,5 @@ package p1
 
 import p2.*
 
-val x: X = X()
-val y: Y = <!INAPPLICABLE_CANDIDATE!>Y<!>()
+<!EXPOSED_PROPERTY_TYPE!>val x: X = X()<!>
+<!EXPOSED_PROPERTY_TYPE!>val y: Y = <!INAPPLICABLE_CANDIDATE!>Y<!>()<!>