fix(HeaderMenu): use composeEventHandlers in HeaderMenu

[tw15egan]

Refs #14311

Adds in composeEventHandlers so that user onClick, onBlur, and onKeyDown functions are respected

Changelog

Changed

• Instead of only calling our event handlers, adds in the composeEventHandlers tool so that user events handlers are respected

Testing / Reviewing

Try passing an onClick with console.log to HeaderMenu. You should see your log

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