refactor: update Duo Workflow commands to use camelCase

Closes #1707

See merge request !2359



Merged-by: Juhee Lee <julee@gitlab.com>
Approved-by: Dylan Bernardi <dbernardi@gitlab.com>
Approved-by: Juhee Lee <julee@gitlab.com>
Reviewed-by: Dylan Bernardi <dbernardi@gitlab.com>
Reviewed-by: Lindsey Shelton <lshelton@gitlab.com>
Co-authored-by: Lindsey Shelton <lshelton@gitlab.com>