feat: update MFE configs to use elm-theme #846

Job	Run time
run_ci (ubuntu-24.04, 3.11, registrar+lms)	21m 43s
run_ci (ubuntu-24.04, 3.11, edx_notes_api+lms)	18m 14s
run_ci (ubuntu-24.04, 3.11, ecommerce+lms)	22m 38s
run_ci (ubuntu-24.04, 3.11, license-manager+lms)	18m 13s
run_ci (ubuntu-24.04, 3.11, designer+lms)	18m 58s
run_ci (ubuntu-24.04, 3.11, analyticsapi+insights+lms)	27m 1s
run_ci (ubuntu-24.04, 3.11, credentials+lms)	18m 46s
run_ci (ubuntu-24.04, 3.11, xqueue)	2m 36s
run_ci (ubuntu-24.04, 3.11, enterprise-subsidy+enterprise-catalog+enterprise-access+lms)	24m 57s
run_ci (ubuntu-24.04, 3.11, edx-exams+lms)	17m 11s
run_ci (ubuntu-24.04, 3.11, discovery+lms+forum)	22m 34s
	3h 32m 51s

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