Ensure that upstream hashicorp vault token renewal is integrated #224
Description
WHAT
With issue eclipse-edc/Connector#3610, in the hashicorp extension a token renewal mechanism has been added, that allows to not use a root token, but to use an normal access token with a ttl and a refresh mechanism that ensures, that there is always an valid access token available. We should check whether this is already in BDRS or if it needs to be added.
Afterwards, the integration test environment for the association should be changed to use this mechanism
WHY
Currently, the token in the test environment expires after some time and has to be manually renewed. It would be quite nice for the stability of the system, when the token is managed by BDRS automatically, so that no manual intervention is needed. The token expiry is typically detected by people trying to use the test environment and fail due to the BDRS outtage.