Fix Kotlin extractor build with rules_kotlin 2.4.21

Stub the compiler's new coroutines classpath entry and keep javac's JDK 25 compatibility warnings from inheriting the Kotlin target's warnings-as-errors setting.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: jketema

java/kotlin-extractor/BUILD.bazel

@@ -91,6 +91,8 @@ _component_registrar_service = (
 kt_javac_options(
     name = "javac-options",
     release = "8",
+    # Keep javac warnings separate from the Kotlin compiler's warn = "error".
+    warn = "off",
 )
 
 [

java/kotlin-extractor/deps.bzl

@@ -27,6 +27,7 @@ def _kotlin_dep_impl(repository_ctx):
         "kotlin-stdlib.jar",
         "kotlin-reflect.jar",
         "kotlin-script-runtime.jar",
+        "kotlinx-coroutines-core-jvm.jar",
         "trove4j.jar",
     ):
         repository_ctx.symlink("empty.zip", jar)