chore: add portal-designer to devstack #594

Job	Run time
run_ci (ubuntu-20.04, 3.11, discovery+lms+forum)	21m 50s
run_ci (ubuntu-20.04, 3.11, registrar+lms)	17m 15s
run_ci (ubuntu-20.04, 3.11, ecommerce+lms)	22m 18s
run_ci (ubuntu-20.04, 3.11, edx_notes_api+lms)	16m 32s
run_ci (ubuntu-20.04, 3.11, credentials+lms)	17m 42s
run_ci (ubuntu-20.04, 3.11, xqueue)	3m 20s
run_ci (ubuntu-20.04, 3.11, analyticsapi+insights+lms)	22m 13s
run_ci (ubuntu-20.04, 3.11, designer+lms)	21m 58s
run_ci (ubuntu-20.04, 3.11, enterprise-catalog+enterprise-access+lms)	23m 2s
run_ci (ubuntu-20.04, 3.11, license-manager+lms)	16m 55s
	3h 3m 5s

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