chore: add portal-designer to devstack #497

Job	Run time
run_ci (ubuntu-20.04, 3.11, discovery+lms+forum)	21m 8s
run_ci (ubuntu-20.04, 3.11, discovery+lms+forum)	21m 8s
run_ci (ubuntu-20.04, 3.11, registrar+lms)	16m 58s
run_ci (ubuntu-20.04, 3.11, registrar+lms)	16m 58s
run_ci (ubuntu-20.04, 3.11, ecommerce+lms)	21m 18s
run_ci (ubuntu-20.04, 3.11, ecommerce+lms)	21m 18s
run_ci (ubuntu-20.04, 3.11, edx_notes_api+lms)	16m 29s
run_ci (ubuntu-20.04, 3.11, edx_notes_api+lms)	16m 29s
run_ci (ubuntu-20.04, 3.11, credentials+lms)	17m 50s
run_ci (ubuntu-20.04, 3.11, credentials+lms)	17m 50s
run_ci (ubuntu-20.04, 3.11, xqueue)	3m 9s
run_ci (ubuntu-20.04, 3.11, xqueue)	3m 9s
run_ci (ubuntu-20.04, 3.11, analyticsapi+insights+lms)	23m 38s
run_ci (ubuntu-20.04, 3.11, analyticsapi+insights+lms)	23m 38s
run_ci (ubuntu-20.04, 3.11, designer+lms)	2m 24s
run_ci (ubuntu-20.04, 3.11, designer+lms)	5h 22m 49s
	9h 26m 13s

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