[Bug] - with versioning, object lock enabled, deleted file with '/' in middle leaves phantom folder in gateway

[lrm25]

Describe the bug
If:

• versitygw is started with versioning enabled
• a bucket is created with object lock enabled
• a file with a folder is added, e.g. "one/two"
• the file is then deleted
• the versions and delete markers are deleted

Then a phantom folder ("one/" in this case) is left in the bucket. This folder does not show up in either list-objects, or list-object-versions, but prevents the bucket from being deleted with a "bucket is not empty" error.

To Reproduce

1. Start versitygw with versioning enabled, e.g.: ./versitygw --access=**** --secret=**** --region=us-east-1 --iam-dir=/Users/lukemccrone/devel/versitygw/iam --cert /Users/lukemccrone/devel/versitygw/cert.pem --key /Users/lukemccrone/devel/versitygw/versitygw.pem posix --versioning-dir /tmp/versioning /tmp/gw
2. Create bucket with object lock enabled, e.g.: aws --no-verify-ssl s3api create-bucket --bucket lrm25-test-bucket --object-lock-enabled-for-bucket
3. Create a test file and copy it, adding a '/' in the middle, e.g.: aws --no-verify-ssl s3 cp test-file s3://lrm25-test-bucket/one/two
4. Remove the file, e.g.: aws --no-verify-ssl s3 rm s3://lrm25-test-bucket/one/two
5. List the old version and delete marker with aws --no-verify-ssl s3api list-object-versions --bucket lrm25-test-bucket
6. Delete these with aws --no-verify-ssl s3api delete-object --bucket lrm25-test-bucket --key one/two --version-id {ID}
7. Verify that nothing is listed with aws --no-verify-ssl s3api list-objects --bucket lrm25-test-bucket and aws --no-verify-ssl s3api list-object-versions --bucket lrm25-test-bucket
8. Attempt to delete the bucket with aws --no-verify-ssl s3api delete-bucket --bucket lrm25-test-bucket

Expected behavior
The bucket is able to be deleted, and no error: An error occurred (BucketNotEmpty) when calling the DeleteBucket operation: The bucket you tried to delete is not empty.

Server Version
Version : v1.0.9
Build : 06d25af
BuildTime: 2025-01-15_05:58:36PM
Darwin Lukes-MacBook-Pro.local 23.4.0 Darwin Kernel Version 23.4.0: Fri Mar 15 00:12:25 PDT 2024; root:xnu-10063.101.17~1/RELEASE_ARM64_T6030 arm64