move EuiFieldSearch's and EuiValidateControl's ref creation out of re… #883
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Fixes #877
Turns out React calls a given
reffunction if it is a different function than the previousref. This degrades developer experience and potentially app performance if thereffunction is created in a component's render method. This behaviour was observed in inEuiFieldSearch, whose render path created new ref functions in two different places, I moved these to setRef class methods instead.