SceneVariableSet: Update all variables in case of error

[Sergej-Vlasov]

when we have chained variables in a repeat panel and one of them fails we do not update remaining ones and repeated panel does not appear because remaining variables are stuck in loading state that forces early return in repeat panel logic and does not render anything.

In order to render the panel with some sort of error message all variables should finish updating.

part of https://github.com/grafana/grafana/pull/91149

📦 Published PR as canary version: 5.7.1--canary.850.10147682812.0

:sparkles: Test out this PR locally via: ```bash npm install @grafana/scenes-react@5.7.1--canary.850.10147682812.0 npm install @grafana/scenes@5.7.1--canary.850.10147682812.0 # or yarn add @grafana/scenes-react@5.7.1--canary.850.10147682812.0 yarn add @grafana/scenes@5.7.1--canary.850.10147682812.0 ```

[grafanabot]

:rocket: PR was released in v5.7.1 :rocket: