``IBootstrap::register`` called for apps that are only enabled for a group of users

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Steps to reproduce

1. Install and enable the Calendar app, but only for some users
2. Open the dashboard as one of the excluded users

Expected behavior

There is no Calendar dashboard

Actual behavior

The Calendar dashboard is there and errors.

Server configuration

Nextcloud version: 22.2

Analysis

Dashboard widgets are just one example. Anything an app registers in that method is there even when it shouldn't.

As far as I could debug this happens because in \OC\AppFramework\Bootstrap\Coordinator::runInitialRegistration OC_App::getEnabledApps() return all apps, regardless of their user groups. That is because of at the time of calling the user context has not been set up yet. Only shortly later we start to load the database user back-end and similar. Afterwards OC_App::getEnabledApps() gives correct results, but not before.

Nevertheless I have not found a way to flip the order of this initialization, it just introduced even more severe problems.

Reproduce the issue with the Calendar app enabled for only some users, then inspect OC\AppFramework\Bootstrap\Coordinator::runInitialRegistration and OC_App::getEnabledApps(). Trace how app registration occurs before the user context is initialized; done means excluded users no longer see or encounter Calendar dashboard widgets or other registrations.