BREAKING CHANGE: Removed unused and misleading custom attributes
used for monitoring:
* `jwt_expires_in`: Removed because it is constant for all requests
and just repeating the setting value. It was also misleading.
* `jwt_is_asymmetric`: Removed because multiple JWTs might be created,
and only the last would be reported, which is misleading. This was
meant to help with a future project to get everyone on to asymmetric
JWTs, but can be added when needed, and probably should ONLY monitor
deprecated (symmetric) usage that needs to be fixed. That can be left
for another day.
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