[Bug] [dashboard] fix dashboard data display bug.

[qijiale76]

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Describe the bug

Try to deploy dashborad in our cluster, found bugs make dashboard data empty, fixed these.

Affects Version(s)

master

Uniffle Server Log Output

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Uniffle Engine Log Output

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Uniffle Server Configurations

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Uniffle Engine Configurations

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Additional context

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Are you willing to submit PR?

• [X] Yes I am willing to submit a PR!