Fix Leaking Listener in BlobStoreRepository (#69110)

We have no guarantees that implementations won't throw a non-IO exception in this spot
so we have to make sure to resolve the listener on any exception to not leak it.

Author: original-brownbear

server/src/main/java/org/elasticsearch/repositories/blobstore/BlobStoreRepository.java

@@ -1416,7 +1416,7 @@ private void initializeRepoGenerationTracking(ActionListener<RepositoryData> lis
                     }
                     existingListener.onFailure(e);
                 };
-                threadPool.generic().execute(() -> doGetRepositoryData(
+                threadPool.generic().execute(ActionRunnable.wrap(
                         ActionListener.wrap(repoData -> clusterService.submitStateUpdateTask(
                                 "set initial safe repository generation [" + metadata.name() + "][" + repoData.getGenId() + "]",
                                 new ClusterStateUpdateTask() {
@@ -1459,7 +1459,7 @@ public void clusterStateProcessed(String source, ClusterState oldState, ClusterS
                                                     , metadata.name(), repoData.getGenId());
                                         });
                                     }
-                                }), onFailure)));
+                                }), onFailure), this::doGetRepositoryData));
             } else {
                 logger.trace("[{}] waiting for existing initialization of repository metadata generation in cluster state",
                         metadata.name());
@@ -1489,9 +1489,9 @@ private void doGetRepositoryData(ActionListener<RepositoryData> listener) {
                 final long generation;
                 try {
                     generation = latestIndexBlobId();
-                } catch (IOException ioe) {
+                } catch (Exception e) {
                     listener.onFailure(
-                        new RepositoryException(metadata.name(), "Could not determine repository generation from root blobs", ioe));
+                        new RepositoryException(metadata.name(), "Could not determine repository generation from root blobs", e));
                     return;
                 }
                 genToLoad = latestKnownRepoGen.updateAndGet(known -> Math.max(known, generation));