feat: add FeaturesProxy integration for feature flag management in CM… #923

Job	Run time
run_ci (ubuntu-24.04, 3.11, ecommerce+lms)	22m 30s
run_ci (ubuntu-24.04, 3.11, registrar+lms)	19m 21s
run_ci (ubuntu-24.04, 3.11, enterprise-subsidy+enterprise-catalog+enterprise-access+lms)	28m 40s
run_ci (ubuntu-24.04, 3.11, discovery+lms+forum)	23m 59s
run_ci (ubuntu-24.04, 3.11, xqueue)	5m 4s
run_ci (ubuntu-24.04, 3.11, license-manager+lms)	21m 5s
run_ci (ubuntu-24.04, 3.11, edx_notes_api+lms)	19m 35s
run_ci (ubuntu-24.04, 3.11, analyticsapi+insights+lms)	24m 18s
run_ci (ubuntu-24.04, 3.11, credentials+lms)	18m 30s
run_ci (ubuntu-24.04, 3.11, designer+lms)	18m 15s
run_ci (ubuntu-24.04, 3.11, edx-exams+lms)	17m 36s
	3h 38m 53s

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