* fix: remove ephemeral posts on refresh
* fix: remove ephemeral posts during app launch
* fix: remove code to await the cleanup
* use built in constant instead of string `system_ephemeral`
* remove sort from `queryPostsByType()`
* switch back to the `await` approach in `cleanupEphemeralPosts`
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Co-authored-by: Mattermost Build <build@mattermost.com>