Edit Billing

[ccremer]

Summary

Allows the user to edit Billing entities, provided they have the permissions to do so. Reuses the form from #525 , but adds logic to handle changed details after updating it

Closes #523

Checklist

• [x] Categorize the PR by setting a good title and adding one of the labels: bug, enhancement, documentation, change, breaking, as they show up in the changelog
• [x] Update tests.
• [x] Link this PR to related issues.

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Helm release	appuio-control-api-preview/portal-pr-531
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Helm release	appuio-control-api-preview/portal-pr-531
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