fix(rust): support Azure Linux base images

[reynoldsbd]

Explicitly support Azure Linux base images in Rust feature.

Required two minor changes:

• Explicitly recognize distro ID azurelinux and map it to the same behavior as mariner
• Explicitly install passwd/shadow-utils package dependency for the groupadd command (which is not present by default in Azure Linux base images)

Also add a rust_with_azurelinux test scenario to validate expected behavior.

Changes validated by running devcontainer features test -f rust locally.