### CI Link

https://gradle-enterprise.elastic.co/s/ou2sap2dhy3q2/tests/:server:internalClusterTest/org.elasticsearch.snapshots.SharedClusterSnapshotRestoreIT/testDataFileFailureDuringSnapshot

### Repro line

./gradlew ':server:internalClusterTest' --tests "org.elasticsearch.snapshots.SharedClusterSnapshotRestoreIT.testDataFileFailureDuringSnapshot" -Dtests.seed=37B64CEE1DCEACEB -Dtests.locale=uk -Dtests.timezone=Africa/Lusaka -Druntime.java=17

### Does it reproduce?

Yes

### Applicable branches

main

### Failure history

_No response_

### Failure excerpt

```
java.lang.Exception: Test abandoned because suite timeout was reached. 
    at __randomizedtesting.SeedInfo.seed([37B64CEE1DCEACEB]:0)
```
server/src/main/java/org/elasticsearch/repositories/blobstore/BlobStoreRepository.java
// 
                                            if (metadata.generation() != RepositoryData.UNKNOWN_REPO_GEN) {
                                                throw new RepositoryException(
                                                    metadata.name(),
                                                    "Found unexpected initialized repo metadata [" + metadata + "]"
                                                );
                                            }
                                            return ClusterState.builder(State)
                                                .metadata(
                                                    Metadata.builder(State.getMetadata())
                                                        .putCustom(
                                                            RepositoriesMetadata.TYPE,
                                                            State.metadata()
                                                                .<RepositoriesMetadata>custom(RepositoriesMetadata.TYPE)
                                                                .withUpdatedGeneration(
                                                                    metadata.name(),
                                                                    repoData.getGenId(),
                                                                    repoData.getGenId()
                                                                )
                                                        )
                                                )
                                                .build();
                                        }
                                        @Override
                                        public void onFailure(Exception e) {
                                            onFailure.accept(e);
                                        }
                                        @Override
                                        public void clusterStateProcessed(ClusterState oldState, ClusterState newState) {
                                            logger.trace(