Remove duplicated `VIEW_MODEL_SCOPE_KEY`

* aosp/2984672 left a unused `VIEW_MODEL_SCOPE_KEY`, replaced by `androidx.lifecycle.viewmodel.internal.VIEW_MODEL_SCOPE_KEY`.

Bug: 264598574
Test: ViewModelScopeTest
Change-Id: I6ea15a5921aa1acfd0bf427e54a5f6db19787604
diff --git a/lifecycle/lifecycle-viewmodel/src/commonMain/kotlin/androidx/lifecycle/ViewModel.kt b/lifecycle/lifecycle-viewmodel/src/commonMain/kotlin/androidx/lifecycle/ViewModel.kt
index 05b1880..e7f3709 100644
--- a/lifecycle/lifecycle-viewmodel/src/commonMain/kotlin/androidx/lifecycle/ViewModel.kt
+++ b/lifecycle/lifecycle-viewmodel/src/commonMain/kotlin/androidx/lifecycle/ViewModel.kt
@@ -182,9 +182,6 @@
     public fun <T : AutoCloseable> getCloseable(key: String): T?
 }
 
-internal const val VIEW_MODEL_SCOPE_KEY =
-    "androidx.lifecycle.viewmodel.internal.ViewModelCoroutineScope.JOB_KEY"
-
 /**
  * The [CoroutineScope] associated with this [ViewModel].
  *