refactor: use object refs instead of deprecated string refs #1866
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Issue Description
String refs are deprecated and React team will be removing them at some point in the future. This PR refactors them into object refs using
createRef
.Related issue: #1866
Approach
React.createRef
,this.refs
object with class properties,ReactDOM.findDOMNode
for refs as they are unnecessary, as the ref already points to a DOM node,TODOs before merging