Log on user authentication token renewal

[krishnangovindraj]

Problem to Solve

The renewal of a user's authentication token can cause noticeable lags - or authentication failure, if the token was invalidated due to a password change and renewal fails. We should add a log line to facilitate debugging.

Proposed Solution

Add a debug line when the token is transparently renewed.

[flyingsilverfin]

Don't forget to to link it to the corresponding PR or vice versa

[krishnangovindraj]

This one is a reminder for dmitrii to implement it in rust.
The java change will get deleted in his merge.