Test connection profiles search behaviors before next libraries release

[ianmcook]

What feature or improvement would you like to see?

Before the ADBC 23 libraries release, let's please double-check that connection profiles search in the driver managers is behaving as documented and as intended.

• Check for any weirdness in Conda environments (to avoid a bug like we had with driver manifests)
• Confirm what search behavior we want in the Python driver manager when running in Python virtual environments
• Confirm that connection profile strings like prod/foo and dev/bar search for the TOML profile files having those basenames within those subdirectories in the profile search locations, and that this works with forward slashes (/) even on Windows.