refactor: pass checkout state as criterion to findBy method

[EmilMassey]

No description provided.

[mamazu]

There might also be a list of orders by customer method in the order repository which would be worth considering.

[mamazu]

I have rebased the branch to the current master and refactored the method in the order repository. Now it should be ready to be merged.

The base of this pull-request was changed, you need fetch and reset your local branch
if you want to add new commits to this pull request. Reset before you pull, else commits
may become messed-up. Unless you added new commits (to this branch) locally that you did not push yet,
execute git fetch origin && git reset "repository-refactor" to update your local branch. Feel free to ask for assistance when you get stuck. 👍

[lchrusciel]

Thank you, Emil! 🥇

[EmilMassey]

Thank you for your help!