[Fix] MyPage UiState/UiEvent 리팩토링 및 UserNickname 관련 로컬 저장소 로직 변경#382

HI-JIN2 merged 6 commits intodevelopEAT-SSU/Android:developfrom

refactor/get-nicknameEAT-SSU/Android:refactor/get-nicknameCopy head branch name to clipboard