[MM-54979] Stop auto opening Boards/Playbooks tabs, close existing open tabs once for users that might have them open #2886
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Summary
To improve overall memory usage, we are electing to stop opening the Boards and Playbooks tabs automatically when a new server is added. These tabs are often left running unnecessarily and take up memory.
Additionally, I've added a migration to close the tabs for everyone who currently has them open. This would be a good memory improvement for those who aren't using the tabs, but will be a bit jarring for those who do. They can re-open them afterwards and shouldn't see any further effects. cc @abhijit-singh on what you think of this approach/if you have any better ideas.
Ticket Link
https://mattermost.atlassian.net/browse/MM-54979