[FIR] Implement NULL_FOR_NONNULL_TYPE diagnostics, fix tests

compiler/testData/diagnostics/testsWithStdLib/coroutines/kt37309.fir.kt

@@ -1,24 +0,0 @@
-// !USE_EXPERIMENTAL: kotlin.RequiresOptIn
-// !DIAGNOSTICS: -UNUSED_VARIABLE
-
-import kotlin.experimental.ExperimentalTypeInference
-
-@OptIn(ExperimentalTypeInference::class)
-fun <E> myBuildList(@BuilderInference builderAction: MutableList<E>.() -> Unit) {
-    ArrayList<E>().builderAction()
-}
-
-@OptIn(ExperimentalStdlibApi::class)
-fun main() {
-    val newList1 = myBuildList {
-        addAll(
-            listOf(1).map { Foo(<!ARGUMENT_TYPE_MISMATCH!>null<!>) }
-        )
-    }
-
-    val newList2 = buildList {
-        addAll(listOf(1,2,3).map{ Foo(<!ARGUMENT_TYPE_MISMATCH!>null<!>) })
-    }
-}
-
-class Foo(val notNullProp: String)

compiler/testData/diagnostics/testsWithStdLib/coroutines/kt37309.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 // !USE_EXPERIMENTAL: kotlin.RequiresOptIn
 // !DIAGNOSTICS: -UNUSED_VARIABLE