Self sign-up for paid plans: show banner when pending selection, complete workflow when plan selected #14847

Job	Run time
tests (python, 05)	16m 30s
tests (python, 6a)	15m 0s
tests (python, bf)	15m 50s
tests (python-sharded-and-javascript)	16m 23s
	1h 3m 43s

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