Allow Snappy to be loaded from a shared classloader

[cescoffier]

This commit introduces a solution for loading the Snappy native library across multiple test profiles. Due to the constraint that native libraries can only be loaded from a single classloader, a shared classloader is now utilized for loading Snappy in test mode.

Please note, this feature is exclusively applicable when running tests.

Fixes: https://github.com/quarkusio/quarkus/issues/39767

[quarkus-bot[bot]]

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