unhide `advanced` commands from `azldev help`

[reubeno]

Pain point: azldev advanced (alias adv) contains essential tools (mock shell, mock build-rpms, mcp, wget) but doesn't appear in azldev --help. Users and agents only discover it if they already know to look.

Proposed: Add a hint at the bottom of azldev --help, e.g.:

Use "azldev advanced --help" for additional tools (mock, mcp, wget).

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Imported on behalf of @dmcilvaney