chore: add portal-designer to devstack #565

Job	Run time
run_ci (ubuntu-20.04, 3.11, discovery+lms+forum)	26m 43s
run_ci (ubuntu-20.04, 3.11, registrar+lms)	16m 48s
run_ci (ubuntu-20.04, 3.11, ecommerce+lms)	20m 49s
run_ci (ubuntu-20.04, 3.11, edx_notes_api+lms)	16m 38s
run_ci (ubuntu-20.04, 3.11, credentials+lms)	17m 7s
run_ci (ubuntu-20.04, 3.11, xqueue)	3m 15s
run_ci (ubuntu-20.04, 3.11, analyticsapi+insights+lms)	22m 33s
run_ci (ubuntu-20.04, 3.11, enterprise-catalog+lms)	22m 29s
run_ci (ubuntu-20.04, 3.11, license-manager+lms)	16m 59s
run_ci (ubuntu-20.04, 3.11, designer+lms)	21m 46s
	3h 5m 7s

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