Black box: update/set FIR status for some new tests

compiler/testData/codegen/box/extensionClasses/constructors.kt

@@ -1,6 +1,7 @@
 // !LANGUAGE: +ContextReceivers
 // TARGET_BACKEND: JVM_IR
 // IGNORE_BACKEND_FIR: JVM_IR
+// FIR status: context receivers aren't yet supported
 // WITH_RUNTIME
 
 class A(val ok: String)

compiler/testData/codegen/box/extensionClasses/contextualPrimaryConstructorWithParams.kt

@@ -1,6 +1,7 @@
 // !LANGUAGE: +ContextReceivers
 // TARGET_BACKEND: JVM_IR
 // IGNORE_BACKEND_FIR: JVM_IR
+// FIR status: context receivers aren't yet supported
 
 class O(val o: String)
 

compiler/testData/codegen/box/extensionClasses/edouble.kt

@@ -1,6 +1,7 @@
 // !LANGUAGE: +ContextReceivers
 // TARGET_BACKEND: JVM_IR
 // IGNORE_BACKEND_FIR: JVM_IR
+// FIR status: context receivers aren't yet supported
 
 class EntityContext {
     var d = DoubleArray(16)

compiler/testData/codegen/box/extensionClasses/genericCollection.kt

@@ -1,6 +1,7 @@
 // !LANGUAGE: +ContextReceivers
 // TARGET_BACKEND: JVM_IR
 // IGNORE_BACKEND_FIR: JVM_IR
+// FIR status: context receivers aren't yet supported
 // WITH_RUNTIME
 
 context(Collection<P>) class A<P> {

compiler/testData/codegen/box/extensionClasses/generics.kt

@@ -1,6 +1,7 @@
 // !LANGUAGE: +ContextReceivers
 // TARGET_BACKEND: JVM_IR
 // IGNORE_BACKEND_FIR: JVM_IR
+// FIR status: context receivers aren't yet supported
 
 context(T) class B<T : CharSequence> {
     val result = if (length == 2) "OK" else "fail"

compiler/testData/codegen/box/extensionClasses/simple.kt

@@ -1,6 +1,7 @@
 // !LANGUAGE: +ContextReceivers
 // TARGET_BACKEND: JVM_IR
 // IGNORE_BACKEND_FIR: JVM_IR
+// FIR status: context receivers aren't yet supported
 
 class A {
     val ok = "OK"

compiler/testData/codegen/box/extensionClasses/typealiasForContextualClass.kt

@@ -1,6 +1,7 @@
 // !LANGUAGE: +ContextReceivers
 // TARGET_BACKEND: JVM_IR
 // IGNORE_BACKEND_FIR: JVM_IR
+// FIR status: context receivers aren't yet supported
 
 class A {
     val ok = "OK"

compiler/testData/codegen/box/extensionClasses/useFromAnotherModule.kt

@@ -1,6 +1,7 @@
 // !LANGUAGE: +ContextReceivers
 // TARGET_BACKEND: JVM_IR
 // IGNORE_BACKEND_FIR: JVM_IR
+// FIR status: context receivers aren't yet supported
 
 // MODULE: lib
 // FILE: A.kt