feat: correct password app reset token call and handle missing users

Fixes for https://gitlab.developers.cam.ac.uk/uis/devops/iam/activate-account/api/-/issues/25

Now returns a 400 - validation error

{
    "crsid": "Password App was unable to find the user"
}

Or 503 - service unavailable - on any other failure

And doesn't retry if the password app couldn't find the user (aka raven db said it didn't exist to set the token on)

assigned to @rjg21

changed the description

added 1 commit

• 1206cd19 - fix: correct and extend reset-token tests

Compare with previous version

requested review from @ee345

resolved all threads

added 1 commit

• 25ba9ace - review: separate exception handling

Compare with previous version

approved this merge request

mentioned in commit 1bb43176

merged

Merged and set 0.14.0 release it MR to merge when its pipeline finishes. Feel free to merge the MR from renovate bot seeing 0.14 being available on Monday else I'll do it Tuesday.

Deployed via: https://gitlab.developers.cam.ac.uk/uis/devops/iam/activate-account/infrastructure/-/merge_requests/84