feat: update most MFE configs to elm-theme #845

Job	Run time
run_ci (ubuntu-24.04, 3.11, credentials+lms)	19m 9s
run_ci (ubuntu-24.04, 3.11, edx_notes_api+lms)	21m 51s
run_ci (ubuntu-24.04, 3.11, registrar+lms)	18m 51s
run_ci (ubuntu-24.04, 3.11, ecommerce+lms)	22m 43s
run_ci (ubuntu-24.04, 3.11, xqueue)	1m 55s
run_ci (ubuntu-24.04, 3.11, designer+lms)	18m 38s
run_ci (ubuntu-24.04, 3.11, enterprise-subsidy+enterprise-catalog+enterprise-access+lms)	25m 0s
run_ci (ubuntu-24.04, 3.11, analyticsapi+insights+lms)	23m 29s
run_ci (ubuntu-24.04, 3.11, discovery+lms+forum)	23m 58s
run_ci (ubuntu-24.04, 3.11, license-manager+lms)	17m 16s
run_ci (ubuntu-24.04, 3.11, edx-exams+lms)	18m 0s
	3h 30m 50s

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