Chore / payments e2e tests stability improvements

[ChristiaanScheermeijer]

Description

I found that the payments e2e tests were failing many times and while looking into this I found some problems in the tests and a bug in the payments form. These fixes should be rebased to #656 and #657.

• The loading times can vary a lot and the biggest culprit was the timeout of I.waitForLoaderDone(), so I increased the timeout for this test specifically
• The SubscriptionService couldn't be injected due to an error in the test build caused by a missing @inject() annotation
• The Checkout form was showing the Adyen card payment form while no payment was needed. This caused the coupon test to fail

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[langemike]

Nice appropriate fixes. Glad you were able to fix this e2e issue