fix: Dynamic port for LEARNING MFE in form of ENV variable #878

Job	Run time
run_ci (ubuntu-24.04, 3.11, registrar+lms)	17m 31s
run_ci (ubuntu-24.04, 3.11, ecommerce+lms)	24m 29s
run_ci (ubuntu-24.04, 3.11, xqueue)	2m 45s
run_ci (ubuntu-24.04, 3.11, license-manager+lms)	17m 6s
run_ci (ubuntu-24.04, 3.11, designer+lms)	18m 34s
run_ci (ubuntu-24.04, 3.11, analyticsapi+insights+lms)	22m 11s
run_ci (ubuntu-24.04, 3.11, credentials+lms)	17m 52s
run_ci (ubuntu-24.04, 3.11, enterprise-subsidy+enterprise-catalog+enterprise-access+lms)	25m 8s
run_ci (ubuntu-24.04, 3.11, edx-exams+lms)	18m 37s
run_ci (ubuntu-24.04, 3.11, edx_notes_api+lms)	19m 3s
run_ci (ubuntu-24.04, 3.11, discovery+lms+forum)	23m 22s
	3h 26m 38s

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