General message to retire the Stack for users even tho they weren't part of the Stack

[brendaasfjnso]

"Seems there is an error making a tester not able to access their group"

[exo404]

I'm fixing this from the contract by giving permission to decommission only for the stack members, but I think we need some changes on the UI too
@Olaleye-Blessing @brendaasfjnso @diterra-code