Deprecate helper image commands

What does this MR do?

Add feature flag to use new helper image cmd

Why was this MR needed?

With !1195 (merged) & !1201 (merged) the bash scripts were moved to Go so that they can be used for windows containers.

If we change the command it would lead into a breaking change for the users to specify which helper image to use.

Introduce a new FF that will allow linux users to use the new command. 28210bdc

Are there points in the code the reviewer needs to double check?

N/A

Does this MR meet the acceptance criteria?

• Documentation created/updated
• Added tests for this feature/bug
• In case of conflicts with master - branch was rebased
• Update deprecation issue to remove the feature flag.

What are the relevant issue numbers?

#3755 (closed)