Move environment variable logging from verbose to debug log level

[romainkomorndatadog]

Logging environment variables risks leaking secrets, and likely isn't necessary in non-debugging scenarios.

Another, more complicated option, would be to have an allowlist (or blocklist) of environment variables to suppress from logging.

[romainkomorndatadog]

Maybe this should've broken some tests. 🤔

[romainkomorndatadog]

Closing this in favor of "we're moving to hatch".