Adds Checkout session token fixture #556

Job	Run time
Unit test (Chrome)	1m 33s
Check	56s
Unit test (Firefox)	1m 57s
Integration test with react-recurly	59s
Unit test (Electron)	2m 38s
Unit test (Safari-Remote)	6m 37s
Unit test (Edge-Remote)	3m 19s
Unit test (iOS-16-Remote)	2m 25s
Unit test (iOS-15-Remote)	15m 50s
Unit test (Android-13-Remote)	2m 33s
Unit test (Android-12-Remote)	7m 4s
Unit test (Android-11-Remote)	3m 17s
End-to-end test (Chrome-Remote)	2m 5s
End-to-end test (Firefox-Remote)	3m 49s
End-to-end test (Safari-Remote)	4m 24s
End-to-end test (Edge-Remote)	3m 54s
End-to-end test (iOS-16-Remote)	5m 22s
End-to-end test (iOS-15-Remote)	4m 35s
End-to-end test (Android-13-Remote)	2m 54s
End-to-end test (Android-12-Remote)	3m 7s
End-to-end test (Android-11-Remote)	3m 5s
Verify required checks	1s
Publish artifacts	36s
	1h 23m 0s

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