[native] Hide a message when a user navigates to its sidebar
[native] Hide a message when a user navigates to its sidebar

Summary: When there's an ongoing transition to a sidebar, we need to hide a message so that it's displayed only once

Test Plan: All the message should be displayed when the state is not defined. Set `currentTransitionSidebarSourceID` to the id of a message and check if the message is hidden

Reviewers: ashoat

Reviewed By: ashoat

Subscribers: KatPo, Adrian, atul

Differential Revision: https://phabricator.ashoat.com/D1687

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