chore(linting): update variable names to include sshd_ prefix

[mattwillsher]

Var names should be prefixed with role name to pass lint checks.

If no time to work on this check can be disabled for now.

[Jakuje]

This was disabled in 34be8e5 (#248) if I see right so I would consider this done. I think we can not accommodate this lint requirement.

[mattwillsher]

The lint issue I've come across recently on a new role but try as I might I couldn't get the name to comply.
I do believe that we should conform to this rule, though, as it's effectively a variable scoping challenge.

I'll leave this open for now as a reminder to myself.

[spetrosi]

In system roles, we deprecated old variables by printint a message to users who use those old variables, and then setting the correct variable name, see https://github.com/linux-system-roles/mssql/blob/main/tasks/main.yml#L12-L25
Then, maybe in a couple years, we can remove the deprecated variable completely.