Docs: Add upgrading/troubleshooting details for repos, config sync, agents #7526
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https://github.com/Icinga/icinga2/issues/7523
https://github.com/Icinga/icinga2/issues/7524
https://github.com/Icinga/icinga2/issues/7522
https://github.com/Icinga/icinga2/issues/7512
https://github.com/Icinga/icinga2/issues/7511
Icinga/icinga-packaging#150
Icinga/icinga-packaging#149
Icinga/icinga-packaging#148
Icinga/icinga-packaging#146
refs #7519
refs #7514