refactor(interop-tests): improve configuration and logging

[acul71]

• Update Docker base images to Debian Trixie
• Use uppercase environment variable names for consistency
• Add debug logging support via DEBUG env var
• Add test_key parameter to allow parallel test runs with isolated Redis keys
• Rename sec_protocol to secure_channel for clarity

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Description

Refactor interop-tests configuration and improve debugging capabilities.

Changes:

• Update Docker base images from Debian Bullseye to Trixie (and use slim variants)
• Standardize environment variable names to uppercase (TRANSPORT, LISTENER_IP, SECURE_CHANNEL, MUXER, IS_DIALER, TEST_TIMEOUT_SECS, REDIS_ADDR)
• Add DEBUG environment variable to enable verbose logging for libp2p components
• Add TEST_KEY parameter to namespace Redis keys, allowing parallel test runs without conflicts
• Rename sec_protocol to secure_channel for clarity throughout the codebase
• Simplify output format for test results

Notes & open questions

• The environment variable naming change is a breaking change for any existing test infrastructure using the old lowercase names
• The TEST_KEY parameter enables running multiple test instances concurrently by isolating their Redis communication channels

Change checklist

• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• A changelog entry has been made in the appropriate crates

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[acul71]

Hi @dhuseby, I've modified the rust v-0.56 to parse debug env var, and other stuff.
I'm not a rust developer, so if someone can chore it.
It's using debian:trixie-slim that is slim updated but dev-rolling, maybe better another distro.....