Consider complete removal of redmine communication hub code
As stated in #7785 the checking for messaged in the Redmine instance serving as communication hub slows down the display of registration working sets a lot (43%)..
see #7935 for more information
- Copied from bug #7908: Redmine communication hub slows down RegistrationWorkingSets added
- Related to task #7935: Discuss new solution to establish the communication between submitter and curator added
- Related to task #7269: Use redmine as message hub for submitter curator communication added
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