feat: select project by role

[david-code]

Description

• Needed to export one of the selectors that I was already using to map user role to project
• Realized in this process, re-reading the redux docs, that the selector was not defined properly, so had to refactor it a bit. The problem was that an intermediary selector was essentially creating a new object, which is not the way the intermediary selector are supposed to work. I separated out the function work and used it in the final selector.
• Changed the tests to adapt to the fact that the refactored selectors use the current user ID, instead of having to provide it explicitly.

Checklist

• Corresponding issue has been opened
• New tests added

Related Issues

Related to techmatters/terraso-mobile-client#143

Verification steps