landing_worker: set debug level according to verbosity CLI option (bug 1935044)

[shtrom]

No description provided.

[zzzeid]

I am a little hesitant to add this, since management commands generally use self.stdout and self.stderr, along with various self.style additions and interpretations of CommandError. So I think we are mixing those concepts with logging here, which generally does not affect output defined within management commands. I think the intended way to use this is to determine where and when to produce output within a management command (e.g., https://github.com/django/django/blob/main/django/core/management/commands/migrate.py#L198).

Edit: However, if we really want to add this kind of functionality, maybe we can add a base management command class with a custom argument that allows you to set the logging level.