fix(virtual_packages): handle invalid chars in LibC family

[ayushman1210]

Description

From<LibC> for GenericVirtualPackage can panic on invalid characters during package name conversion, as there was an unhandled unwrap() on string parsing.
This PR fixes the panic by removing non-alphanumeric characters, replacing them with _.

Because libc.family is arbitrary text pulled from the OS, if it contains characters that are invalid for conda package names (like spaces or parentheses), the string parsing would fail and .unwrap() would panic, completely crashing the application.

This correctly implements the TODO comment that noted the family string should be sanitized (e.g., replacing invalid characters) before converting it into a package name to prevent this panic.

Fixes #2208

How Has This Been Tested?

Added 1 unit test in crates/rattler_virtual_packages/src/lib.rs to verify that libc.family strings with parentheses and spaces are properly sanitized into package names.

cargo test -p rattler_virtual_packages

AI Disclosure

• This PR contains AI-generated content. (The code changes and tests were drafted with the help of an AI assistant)
  • I have tested any AI-generated content in my PR.
  • I take responsibility for any AI-generated content in my PR.
    Tools: Google Gemini

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added sufficient tests to cover my changes.

[ayushman1210]

hey @baszalmstra please review this pr when you have some free time and if any changes needed please let me know
thanks !!