fix: Thread Participant Count Fails to Update on Complete Deletion of User Messages.

[ashu565]

Proposed changes (including videos or screenshots)

1. Resolved the issue of participant count not updating accurately in a thread.

Video for the final functionality

https://github.com/RocketChat/Rocket.Chat/assets/64376712/b9145c13-715c-4c7f-ae6f-2a15a8e267cd

Issue(s)

Closes #31633

Steps to test or reproduce

Further comments

[changeset-bot[bot]]

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Latest commit: 919190e49e4ff31117cd44e25001b4ed86e435df

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