Add edx exams service to Devstack (#86) #814

Job	Run time
run_ci (ubuntu-24.04, 3.11, designer+lms)	16m 46s
run_ci (ubuntu-24.04, 3.11, analyticsapi+insights+lms)	21m 21s
run_ci (ubuntu-24.04, 3.11, registrar+lms)	17m 38s
run_ci (ubuntu-24.04, 3.11, credentials+lms)	17m 37s
run_ci (ubuntu-24.04, 3.11, license-manager+lms)	17m 10s
run_ci (ubuntu-24.04, 3.11, edx_notes_api+lms)	16m 12s
run_ci (ubuntu-24.04, 3.11, ecommerce+lms)	21m 8s
run_ci (ubuntu-24.04, 3.11, enterprise-subsidy+enterprise-catalog+enterprise-access+lms)	22m 49s
run_ci (ubuntu-24.04, 3.11, xqueue)	2m 57s
run_ci (ubuntu-24.04, 3.11, discovery+lms+forum)	23m 12s
run_ci (ubuntu-24.04, 3.11, edx-exams+lms)	16m 46s
	3h 13m 36s

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