Refactor getSafeWithOwners function to accept an object as an argument

[mmv08]

Context/issue

Currently, the getSafeWithOwners test utility function accepts all the necessary parameters as standalone variables. In general, it's a good practice in the JavaScript world to use an object instead when the number of parameters exceeds a certain threshold to ease the addition of new ones.

For more context, see the discussion and pain of introducing new parameters here #759 (comment)

Proposed solution

Use an object to accept all the necessary parameters for safe setup
Bonus points: find other functions that would benefit from this

Alternatives

Don't do anything