[CI Minutes] Create a banner to display success from purchasing CI Minutes
Create a banner to display success from purchasing CI Minutes. ### Criteria || |-| |![ci-purchase-banner](/uploads/47436940379f5392d8007405edeef91a/ci-purchase-banner.png)| The banner should - use the `GlAlert` component - be of type `success` - be dismissible - have title: `Thanks for your purchase!` - have content: `You have successfully purchased CI minutes. You'll receive a receipt by mail.` ### Implementation plan ||| |-|-| | Add ~backend preparatory logic and banner | gitlab-org/gitlab!66901 | | Add ~frontend logic to show banner after successful purchase | gitlab-org/gitlab!66451 |
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