chore: add portal-designer to devstack #586

Job	Run time
run_ci (ubuntu-20.04, 3.11, discovery+lms+forum)	22m 56s
run_ci (ubuntu-20.04, 3.11, registrar+lms)	16m 46s
run_ci (ubuntu-20.04, 3.11, ecommerce+lms)	22m 45s
run_ci (ubuntu-20.04, 3.11, edx_notes_api+lms)	17m 39s
run_ci (ubuntu-20.04, 3.11, credentials+lms)	17m 46s
run_ci (ubuntu-20.04, 3.11, xqueue)	3m 24s
run_ci (ubuntu-20.04, 3.11, analyticsapi+insights+lms)	22m 31s
run_ci (ubuntu-20.04, 3.11, designer+lms)	22m 19s
run_ci (ubuntu-20.04, 3.11, enterprise-catalog+lms)	22m 17s
run_ci (ubuntu-20.04, 3.11, license-manager+lms)	17m 15s
	3h 5m 38s

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