Serialize OptIn to builtins, improve tests

Skip SOURCE-retention annotations in builtins serialization tests,
because otherwise the source analysis result can't be equal to the
metadata deserialization result.

 #KT-53073 Fixed

core/builtins/build.gradle.kts

@@ -37,16 +37,13 @@ val runtimeElementsJvm by configurations.creating {
 val prepareRangeSources by tasks.registering(Sync::class) {
     from(kotlinRangesCommon) {
         exclude("Ranges.kt")
-        filter { line -> line.takeUnless { "@OptIn" in it } }
-        filter(org.apache.tools.ant.filters.FixCrLfFilter::class, "eol" to org.apache.tools.ant.filters.FixCrLfFilter.CrLf.newInstance("lf"))
     }
     from(kotlinCollectionsCommon) {
         include("PrimitiveIterators.kt")
     }
     from(kotlinAnnotationsCommon) {
         include("ExperimentalStdlibApi.kt")
-        filter { line -> line.takeUnless { "@RequiresOptIn" in it } }
-        filter(org.apache.tools.ant.filters.FixCrLfFilter::class, "eol" to org.apache.tools.ant.filters.FixCrLfFilter.CrLf.newInstance("lf"))
+        include("OptIn.kt")
     }
 
     into(rangesCherryPicked)