Add edx exams service to Devstack #777

Job	Run time
run_ci (ubuntu-24.04, 3.11, discovery+lms+forum)	21m 14s
run_ci (ubuntu-24.04, 3.11, registrar+lms)	16m 19s
run_ci (ubuntu-24.04, 3.11, ecommerce+lms)	20m 47s
run_ci (ubuntu-24.04, 3.11, edx_notes_api+lms)	15m 48s
run_ci (ubuntu-24.04, 3.11, credentials+lms)	16m 53s
run_ci (ubuntu-24.04, 3.11, xqueue)	1m 58s
run_ci (ubuntu-24.04, 3.11, analyticsapi+insights+lms)	22m 50s
run_ci (ubuntu-24.04, 3.11, designer+lms)	16m 55s
run_ci (ubuntu-24.04, 3.11, enterprise-subsidy+enterprise-catalog+enterprise-access+lms)	23m 9s
run_ci (ubuntu-24.04, 3.11, license-manager+lms)	16m 6s
run_ci (ubuntu-24.04, 3.11, edx-exams+lms)	17m 47s
	3h 9m 46s

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