[Tez WebUI] Error 404 is reported when users access the Tez WebUI

When a user logs in to Manager and switches to the Tez web UI, error 404 or 503 is displayed.

The Tez web UI depends on the TimelineServer instance of Yarn. Therefore, TimelineServer must be installed in advance and in the Good state.

Parent topic: Common Exceptions in Accessing the MRS Web UI

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