FSX defaults file ownership to root

**Environment:**
- pcluster version 2.4.1
- base_os = centos7
- Scheduler: SGE
- compute_instance_type = c5n.18xlarge
- master_instance_type = c5.xlarge
- fsx_settings = fsxshared

[fsx fsxshared]
shared_dir = /fsx
storage_capacity = 3600
imported_file_chunk_size = 1024
import_path = s3://pmjfsx
export_path = s3://pmjfsx

**Bug description and how to reproduce:**
Create a cluster with FSX and use a bucket to fill the file system via import_path. The files belong to root. As there is a user created called centos and the user logs is as this user then these files shoudl belong to that suer and not root

```
[centos@ip-10-0-0-226 fsx]$ cd /fsx
[centos@ip-10-0-0-226 fsx]$ ls -l
total 65
drwxr-xr-x 4 root root 33280 Nov 15 07:49 sims
drwxr-xr-x 2 root root 33280 Nov 15 07:49 utils
```

No source file, test, or entry point is named. Reproduce the issue with the reported pcluster 2.4.1 CentOS 7 configuration, including FSX import_path and export_path, then trace cluster setup for the imported files. Done means files under /fsx have the intended ownership for the centos user rather than root.

Written by the indexing model from the issue text.