Promote collection builders to stable #KT-47421

compiler/fir/analysis-tests/testData/resolveWithStdlib/inference/builderInferenceAndCoercionToUnit.kt

@@ -2,7 +2,7 @@ class DropDownComponent<T : Any>(val initialValues: List<T>)
 
 fun test(strings: List<String>) {
     val dropDown = DropDownComponent(
-        initialValues = <!OPT_IN_USAGE_ERROR!>buildList<!> {
+        initialValues = buildList {
             addAll(strings)
         }
     )

compiler/fir/analysis-tests/testData/resolveWithStdlib/inference/builderInferenceFromStdlib.kt

@@ -1,5 +1,5 @@
 fun test_1() {
-    val list = <!OPT_IN_USAGE_ERROR!>buildList<!> {
+    val list = buildList {
         add("")
     }
     takeList(list)