chore: add portal-designer to devstack #576

Job	Run time
run_ci (ubuntu-20.04, 3.11, discovery+lms+forum)	2m 22s
run_ci (ubuntu-20.04, 3.11, registrar+lms)	2m 45s
run_ci (ubuntu-20.04, 3.11, ecommerce+lms)	2m 49s
run_ci (ubuntu-20.04, 3.11, edx_notes_api+lms)	2m 45s
run_ci (ubuntu-20.04, 3.11, credentials+lms)	2m 41s
run_ci (ubuntu-20.04, 3.11, xqueue)	2m 13s
run_ci (ubuntu-20.04, 3.11, analyticsapi+insights+lms)	2m 41s
run_ci (ubuntu-20.04, 3.11, designer+lms)	2m 17s
run_ci (ubuntu-20.04, 3.11, enterprise-catalog+lms)	2m 44s
run_ci (ubuntu-20.04, 3.11, license-manager+lms)	2m 35s
	25m 52s

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