Fix sidebar data loading for users

[JammingBen]

Description

This PR improves the loading of additional user data which is needed in the sidebar.

Before, this was handled by a custom showPanel event, that first loaded the additional data, then opened the sidebar. Problems here:

1. This event was only fired on action click, not on select (see Loading additional user data does not work when opening sidebar via select-toggle #8275).
2. We might have deeper component structures in the future. When some deep component (or a composable) wants to emit this event, we'd need to propagate the event all the way to the parent view component.
3. There is no loading-indicator for the user. This might be no issue here, but in general this is bad.

The new approach uses the eventBus which is coupled with the useSidebar composable. Opening/closing the sidebar and setting the active panels is all being handled by the composable. Furthermore, the additional data is being loaded when a user gets selected. This way, it works on select-toggle as well.

Also, the sidebar now uses the loading state properly to show a loading spinner during data loading.

Related Issue

• Fixes Loading additional user data does not work when opening sidebar via select-toggle #8275

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Technical debt
• Tests

[dschmidt]

Nice 👍🏻

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
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0 Security Hotspots
1 Code Smell

69.0% Coverage
0.0% Duplication