Sessions: instructor view results: stop showing a random identifier for anonymous responses

[bqnguyen94]

As per #6092, we need to stop displaying the random hash in anonymised participants' name, e.g. Anonymous student 1234567890 to Anonymous student. #8443 addresses this by removing the hash before data is rendered, but only for student view; instructor users can still see the trailing hash and could trace the anonymised student. Ideally, we should remove the hash completely from FeedbackSessionResultsBundle.

[undermyumbrella1]

Hi I have created a pr to try to fix this issue and possibly discuss if my approach is ok. May I request for some help reviewing it? Thank you!