Add edx exams service to Devstack #776

Job	Run time
run_ci (ubuntu-24.04, 3.11, discovery+lms+forum)	20m 51s
run_ci (ubuntu-24.04, 3.11, registrar+lms)	17m 22s
run_ci (ubuntu-24.04, 3.11, ecommerce+lms)	21m 2s
run_ci (ubuntu-24.04, 3.11, edx_notes_api+lms)	16m 12s
run_ci (ubuntu-24.04, 3.11, credentials+lms)	17m 11s
run_ci (ubuntu-24.04, 3.11, xqueue)	2m 1s
run_ci (ubuntu-24.04, 3.11, analyticsapi+insights+lms)	22m 20s
run_ci (ubuntu-24.04, 3.11, designer+lms)	17m 26s
run_ci (ubuntu-24.04, 3.11, enterprise-subsidy+enterprise-catalog+enterprise-access+lms)	23m 12s
run_ci (ubuntu-24.04, 3.11, license-manager+lms)	17m 59s
run_ci (ubuntu-24.04, 3.11, edx-exams+lms)	16m 35s
	3h 12m 11s

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