Add status message field for registries

...c/main/java/edu/kit/scc/webreg/entity/RegistryEntity.java

...kit/scc/webreg/approval/ApproverRoleApprovalWorkflow.java

...t/scc/webreg/drools/impl/KnowledgeSessionServiceImpl.java

...kit/scc/webreg/drools/impl/KnowledgeSessionSingleton.java

...du/kit/scc/webreg/dto/service/RegistryDtoServiceImpl.java

.../edu/kit/scc/webreg/job/AbstractDeregisterRegistries.java

...du/kit/scc/webreg/service/impl/UserDeleteServiceImpl.java

...java/edu/kit/scc/webreg/service/impl/UserServiceImpl.java

...du/kit/scc/webreg/service/impl/UserUpdateServiceImpl.java

...ain/java/edu/kit/scc/webreg/service/impl/UserUpdater.java

...u/kit/scc/webreg/service/oidc/client/OidcUserUpdater.java

...a/edu/kit/scc/webreg/service/reg/RegisterUserService.java

...in/java/edu/kit/scc/webreg/service/reg/impl/Approvor.java

.../scc/webreg/service/reg/impl/RegisterUserServiceImpl.java

...java/edu/kit/scc/webreg/service/reg/impl/Registrator.java

...n/java/edu/kit/scc/webreg/bean/DeregisterServiceBean.java

.../java/edu/kit/scc/webreg/bean/admin/ShowRegistryBean.java

...scc/webreg/bean/sadm/user/ServiceAdminUserDetailBean.java