Fix briefly incorrect state when upgrading to Usage-Based Billing

[jankeromnes]

Bug description

Part of #9036

When you upgrade a team to Usage-Based Billing, you might see a briefly incorrect state in the UI before the upgrade shows as "pending":

The UI embedded on the Gitpod side went through a slightly confusing transition where it went back to a 'not enabled' state after putting in card details, before transitioning to the 'manage billing' UI.

Source: #10630 (review)

Steps to reproduce

1. Upgrade a team to Usage-Based Billing by adding a credit card
2. After submitting, you might briefly see the UI in "Billing: Not enabled" state with an active "Add Payment Method" button (i.e. what you just did, which is confusing) before it eventually switched to the correct "pending" state, and then finally the "Billing: Enabled" state when the Stripe processing is done

Workspace affected

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Expected behavior

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Example repository

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Anything else?

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