Finalize staged data tests is timing out when tested with a real AWS S3 storage backend

[G-D-Petrov]

Describe the bug

The test is timing out when tested with a real s3 storage because it because too slow (e.g. failing run here) For that reason the test is now using only lmdb as backend (e.g. changed here).

Steps/Code to Reproduce

Run test_finalize_monotonic_unique_chunks with basic_arctic_library

Expected Results

The test shouldn't be timing out

OS, Python Version and ArcticDB Version

Any Python Version

Backend storage used

AWS S3

Additional Context

No response