AT:

• the user operation import is being removed
• the user operation information is being removed from the process instance index
• the update script is adjusted accordingly
• the user operation max page size configuration is being removed from the configuration + remove it from the configuration documentation in the technical guide
• remove the user operations from the listed imported entities in the technical guide.

Context:
Since we imported the historic identity links with Optimize 2.5, we have all the information to calculate the exact working/idle time. Therefore, we should calculate it and get rid of all the code that's not needed any longer.