Fix a race condition in remote cache

Previously, outerF.setExeception was set before closing the output stream of the download file when download fails. This was causing a permission error when trying to delete the file on Windows.

Fixes #6890

RELNOTES: None
PiperOrigin-RevId: 228138102

src/main/java/com/google/devtools/build/lib/remote/AbstractRemoteActionCache.java

@@ -426,12 +426,13 @@ public void onSuccess(Void result) {
 
           @Override
           public void onFailure(Throwable t) {
-            outerF.setException(t);
             try {
               out.close();
             } catch (IOException e) {
               // Intentionally left empty. The download already failed, so we can ignore
               // the error on close().
+            } finally {
+              outerF.setException(t);
             }
           }
         },