### CI Link

https://gradle-enterprise.elastic.co/s/2wbpgc72g2qsm/tests/:server:internalClusterTest/org.elasticsearch.snapshots.SnapshotStressTestsIT/testRandomActivities?top-execution=1

### Repro line

./gradlew ':server:internalClusterTest' --tests "org.elasticsearch.snapshots.SnapshotStressTestsIT.testRandomActivities" -Dtests.seed=7FD24A23B626E47 -Dtests.locale=sq-AL -Dtests.timezone=Asia/Khandyga -Druntime.java=20

### Does it reproduce?

No

### Applicable branches

8.8

### Failure history

https://gradle-enterprise.elastic.co/scans/tests?search.startTimeMax=1689083199013&search.startTimeMin=1688418000000&search.timeZoneId=Europe/Bucharest&tests.container=org.elasticsearch.snapshots.SnapshotStressTestsIT&tests.test=testRandomActivities

### Failure excerpt

```
java.lang.AssertionError: java.lang.AssertionError: java.lang.NullPointerException: Cannot invoke "org.elasticsearch.cluster.SnapshotsInProgress$Entry.failure()" because "entry" is null
	at __randomizedtesting.SeedInfo.seed([7FD24A23B626E47]:0)
	at org.elasticsearch.snapshots.SnapshotsService.finalizeSnapshotEntry(SnapshotsService.java:1460)
	at org.elasticsearch.snapshots.SnapshotsService.runNextQueuedOperation(SnapshotsService.java:1548)
	at org.elasticsearch.snapshots.SnapshotsService.lambda$finalizeSnapshotEntry$28(SnapshotsService.java:1441)
	at org.elasticsearch.action.ActionListener$2.onResponse(ActionListener.java:158)
	at org.elasticsearch.repositories.FinalizeSnapshotContext.onResponse(FinalizeSnapshotContext.java:117)
	at org.elasticsearch.repositories.blobstore.BlobStoreRepository.lambda$finalizeSnapshot$41(BlobStoreRepository.java:1390)
	at org.elasticsearch.action.ActionListener$2.onResponse(ActionListener.java:158)
	at org.elasticsearch.action.ActionRunnable$2.accept(ActionRunnable.java:50)
	at org.elasticsearch.action.ActionRunnable$2.accept(ActionRunnable.java:47)
	at org.elasticsearch.action.ActionRunnable$3.doRun(ActionRunnable.java:72)
	at org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingAbstractRunnable.doRun(ThreadContext.java:983)
	at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:26)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
	at java.base/java.lang.Thread.run(Thread.java:1623)
Caused by: java.lang.AssertionError: java.lang.NullPointerException: Cannot invoke "org.elasticsearch.cluster.SnapshotsInProgress$Entry.failure()" because "entry" is null
	... 15 more
Caused by: java.lang.NullPointerException: Cannot invoke "org.elasticsearch.cluster.SnapshotsInProgress$Entry.failure()" because "entry" is null
	at org.elasticsearch.snapshots.SnapshotsService.finalizeSnapshotEntry(SnapshotsService.java:1324)
	... 14 more
```
server/src/main/java/org/elasticsearch/repositories/blobstore/BlobStoreRepository.java
* the given list of blobs in the shard container.
     *
     * @param blobs      list of blobs in repository
     * @param generation shard generation or {@code null} in case there was no shard generation tracked in the {@link RepositoryData} 
     *                   this shard because its snapshot was created in a version older than
     *                   {@link SnapshotsService#SHARD_GEN_IN_REPO_DATA_VERSION}.
     * @return tuple of BlobStoreIndexShardSnapshots and the last snapshot index generation
     */
    private Tuple<BlobStoreIndexShardSnapshots, ShardGeneration> buildBlobStoreIndexShardSnapshots(
        Set<String> blobs,
        BlobContainer shardContainer,
        @Nullable ShardGeneration generation
    ) throws IOException {
        if (generation != null) {
            if (generation.equals(ShardGenerations.NEW_SHARD_GEN)) {
                return new Tuple<>(BlobStoreIndexShardSnapshots.EMPTY, ShardGenerations.NEW_SHARD_GEN);
            }
            return new Tuple<>(
                INDEX_SHARD_SNAPSHOTS_FORMAT.read(metadata.name(), shardContainer, generation.toBlobNamePart(), namedXContentRegistry),
                generation
            );
        }
        final Tuple<BlobStoreIndexShardSnapshots, Long> legacyIndex = buildBlobStoreIndexShardSnapshots(blobs, shardContainer);
        return new Tuple<>(legacyIndex.v1(), new ShardGeneration(legacyIndex.v2()));
    }
    /**
     * Loads all available snapshots in the repository
     *
     * @param blobs list of blobs in repository
     * @return tuple of BlobStoreIndexShardSnapshots and the last snapshot index generation