[Bug] Display the first successful registration time in Dashboard

[rickyma]

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Describe the bug

Now the ResigerTime(which is spelled incorrectly, should be RegistrationTime) for shuffle servers is always displaying the latest registration time, which is useless and changing all the time? The registration time is updated with each heartbeat report. Shouldn't we be displaying the time of the first successful registration, rather than the time of the most recent successful heartbeat report? If the shuffle server is always active, why not display the first successful registration time?

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?

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