Fixed a bug where the bubble-type typing indicator did not trigger scrolling to the bottom from the second time it was displayed

[danney-chun]

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[fix]: Fixed a bug where the bubble-type typing indicator did not trigger scrolling to the bottom from the second time it was displayed.

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Fixes <TICKET_ID>

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## External Contributions

- Multi Tab 테스트 과정에서 buble typing indecator를 사용을 했을때,  indicator가 2번째로 보여질때 부터 Scroll이 bottome으로 가질 않아, indicator가 보이지 않는 문제가 있어 수정을 했습니다.

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[OnestarLee]

lgtm!

[OnestarLee]

if (typingMembers.length === 0) return null; 로 length가 0일때는 useLayoutEffect 호출이 안되고 typingMembers.length > 0 이상일경우 마운트 이후 첫 호출이 될거라 didMountRef 는 제외 해도 될것 같습니다