[Gradle] Do not try snapshotting non-existent classpath entries

The fix changes only Gradle's side of the transformation to be consistent with general Gradle behaviour for non-existent dependencies in classpath
^KT-62101 In Progress

libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/internal/transforms/BuildToolsApiClasspathEntrySnapshotTransform.kt

@@ -71,6 +71,8 @@ abstract class BuildToolsApiClasspathEntrySnapshotTransform : TransformAction<Bu
             checkVersionConsistency()
         }
         val classpathEntryInputDirOrJar = inputArtifact.get().asFile
+        if (!classpathEntryInputDirOrJar.exists()) return
+
         val snapshotOutputFile = outputs.file(classpathEntryInputDirOrJar.name.replace('.', '_') + "-snapshot.bin")
 
         val granularity = getClassSnapshotGranularity(classpathEntryInputDirOrJar, parameters.gradleUserHomeDir.get().asFile)