Don't show invalid Refresh button in cluster certificates list

[richard-cox]

Summary

Fixes #14423

Occurred changes and/or fixed issues

• see issue for detail
• fix is to break visibility of refresh button on singleton isTooManyItemsToAutoUpdate

Areas or cases that should be tested

as per issue

Areas which could experience regressions

manual refresh button with vai on (though note this is soon to be hidden via another PR)

Checklist

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