feat: 개인후원자 목록의 fallback message를 지정할 수 있도록 수정 #121

Job	Run time
config	2s
build (admin-dev, pyconkr-admin)	59s
build (pyconkr-dev, pyconkr-2026)	51s
build (participant-dev, pyconkr-participant-portal)	49s
trigger	9s
	2m 50s

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