sg: remove feedback flag from parent command

Created by: BolajiOlajide

Test plan

Running a parent command (i.e a. command that has subcommands) like sg db or sg migration now displays the appropriate help text.

Context

When I ran a parent command sg adr to get the available subcommands resulted in a panic. I tested with commands without subcommands, and they work fine.

Before	After

A major side-effect of this PR is that the parent commands won't have the --feedback flag included in the doc anymore, however the flag will continue to work. The documentation generated should reflect the above point.