Investigate the slow response when get user role assignment in the tables

[MCatherine1994]

Describe the task
Noticed that it's kind of slow when trying to load user role assignments data in the tables. It could because we're trying to grab the data for both user table and delegated admin tables.

Acceptance Criteria

• Fetch user role assignment data and delegated admin asynchronously (currently we're doing it sequentially)
• Investigate the estimate time cost
• Enter the router to display something first and then grab the data

Additional context

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