Exit early progressive loads if the load task is canceled

Add an check when loading progressive media in case the load
is canceled. If the player is released very early, the progressive
media period may carry on with the initial loading unnecessarily.

PiperOrigin-RevId: 586288385

libraries/exoplayer/src/main/java/androidx/media3/exoplayer/source/ProgressiveMediaPeriod.java

@@ -1027,6 +1027,9 @@ public void load() throws IOException {
           long position = positionHolder.position;
           dataSpec = buildDataSpec(position);
           long length = dataSource.open(dataSpec);
+          if (loadCanceled) {
+            break;
+          }
           if (length != C.LENGTH_UNSET) {
             length += position;
             onLengthKnown();