[2.4.0] Checkmk Werk 16617 created: Use session specific key for ValueSpec encryption

[//]: # (werk v2) # Use session specific key for ValueSpec encryption key | value ---------- | --- date | 2024-03-15T15:28:00+00:00 version | 2.4.0b1 class | feature edition | cre component | wato level | 1 compatible | yes When a user edits a configuration e.g. for a special agent with an explicit password the complete configuration is transfered to the user. To not reveal the password in cleartext this field is encrypted. The key for that encryption was previously to this Werk shared amongst all users (a salt was used though). With this Werk every user session has now a secret dedicated to this encryption so the key is rotated often and not shared amongst other users.