MM-62104 Fix board disappearing or move to default category when switching teams

[Rajat-Dabade]

Summary

I was able to identify a way to reproduce this issue and pinpoint its root cause. This issue has been present for a long time, even before the pre-split.

Steps to Reproduce:

• Create a category in the board sidebar.
• Create a board within that category.
• Observe that there are now two categories in the sidebar: the one you created and the default Boards category.
• Switch to a different team.
• Switch back to the team where you created the category.
• Observe the issue: the board is either no longer in the created category or has been moved to the default Boards category.

Root Cause: This is a client-side issue caused by a this useEffect that executes before the Redux store is updated with the latest sidebar information. As a result, the /api/v2/teams/{teamID}/categories/{categoryId}/boards/{boardID} API is called with an empty categoryId. This causes the board to be incorrectly moved to the default Boards category.

Ticket Link

https://mattermost.atlassian.net/browse/MM-62104