Code drop

- XPLANBOX-2670 - set release date (ede1a582)
- XPLANBOX-2670 - updated changelog and Aktualisierungsanleitung (38babac7)
- XPLANBOX-2659 - fixed merge; removed outdated xplan-cli/xplan-cli-docker (a925e41a)
- XPLANBOX-2494 - simplified date tests to ensure passing until XPLANBOX-2664 is processed (b77e576f)
- XPLANBOX-2682 - fixed internal server error (f2f9560a)
- XPLANBOX-2671 - unpack xplan-manager-wenb webapps (ebb89ce8)
- XPLANBOX-2666 - simple fix of non integer sonstPlanArt values to avoid internal server error (ef6753e4)
- XPLANBOX-2666 - added sonstPlanArt to plan BP_6.0.gml (fb1e1a27)
- XPLANBOX-2640 - implement SpringBootServletInitializer to run the application as deployable WAR (7f8f1239)
- XPLANBOX-2658 build and deploy missing docker images (65005614)
- XPLANBOX-2659 verify docker context tar file size (fc098186)

Co-authored-by: Lyn Elisa Goltz <goltz@lat-lon.de>
Co-authored-by: Marc Guillemot <guillemot@lat-lon.de>

Dropped from commit: 40378827