Cleanup of prior versions of milvus lite when installing the latest version

[YasharF]

Hi there! I’ve been using Milvus Lite by running the command pip install milvus in WSL/Ubuntu. However, I’ve noticed an issue related to version management during installation.

Current Behavior:

When installing a new version of Milvus Lite, the server files are placed in ~/.milvus.io/milvus-server/[version].

• Unfortunately, it looks like the installation script doesn't handle the older versions that have been already installed.
• As a result, each new version creates a new folder, consuming approximately 500 MB of disk space.
• There’s no notification or guidance provided to users about these older versions.

Desired Behavior:

The installation script is enhanced to:

• Detect the presence of older Milvus Lite server versions.
• Provide clear instructions to users about the existing version(s) and how to clean them up (aka rm -rf ~/.milvus.io/milvus-server/3.2.13 I'm not sure if this is safe to do)
• Optionally, offer an automated way to remove older versions.

This improvement would prevent unnecessary bloating of the file system. Thank you for considering this enhancement!