feat(e2e): Expand buy-coin test to full flow #4760

Job	Run time
extract-branch	3s
build-deploy	8m 17s
methods / core_in_popup	5m 57s
methods / web	5m 58s
methods / webextension	0s
passphrase / core_in_popup	2m 42s
passphrase / web	3m 39s
passphrase / webextension	2m 54s
permissions / web	2m 30s
browser-support / web	2m 47s
browser-support / core_in_popup	0s
browser-support / webextension	0s
permissions / core_in_popup	0s
permissions / webextension	0s
popup-close / core_in_popup	3m 57s
popup-close / web	5m 57s
popup-close / webextension	3m 45s
popup-pages / core_in_popup	0s
popup-pages / web	2m 25s
popup-pages / webextension	0s
transport / core_in_popup	0s
transport / web	3m 15s
transport / webextension	0s
unchained / web	0s
unchained / core_in_popup	0s
unchained / webextension	0s
webextension-examples / web	0s
webextension-examples / core_in_popup	0s
webextension-examples / webextension	2m 47s
	56m 53s

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