fix: Dynamic port for LEARNING MFE in form of ENV variable #876

Job	Run time
run_ci (ubuntu-24.04, 3.11, edx_notes_api+lms)	18m 30s
run_ci (ubuntu-24.04, 3.11, ecommerce+lms)	22m 29s
run_ci (ubuntu-24.04, 3.11, discovery+lms+forum)	23m 13s
run_ci (ubuntu-24.04, 3.11, registrar+lms)	18m 20s
run_ci (ubuntu-24.04, 3.11, xqueue)	2m 49s
run_ci (ubuntu-24.04, 3.11, credentials+lms)	18m 16s
run_ci (ubuntu-24.04, 3.11, license-manager+lms)	17m 10s
run_ci (ubuntu-24.04, 3.11, edx-exams+lms)	17m 50s
run_ci (ubuntu-24.04, 3.11, analyticsapi+insights+lms)	23m 0s
run_ci (ubuntu-24.04, 3.11, enterprise-subsidy+enterprise-catalog+enterprise-access+lms)	24m 11s
run_ci (ubuntu-24.04, 3.11, designer+lms)	19m 36s
	3h 25m 24s

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