Feature: improve logging of user assignment and deassigment

[tograss]

Checklist before requesting a review

Please delete options that are not relevant.

• I have read the CONTRIBUTING document.
• I have performed a self-review of my code.
• I have added tests that prove my fix is effective or that my feature works.
  The added code is covered by existing tests. If you need more tests for this Feature could you advise where to place them ?
• This change requires a documentation update.

Description

• It fixes Log from which position a user is removed #21059
  This pull requests does two things:
  It adds recording to which position an Actor is assigned for problems and changes.
  It adds recording when a user is removed from a position for tickets, problems and changes.

[cedric-anne]

The added code is covered by existing tests. If you need more tests for this Feature could you advise where to place them ?

If there are existing tests testing the produced logs entries, please indicate their class/method name, so we can check them. Otherwise, you should add tests for each impacted class and you can see how it is done in the Profile_UserTest::testLogOperationOnAddAndDelete() test method.