fix(components): guard event.persist() calls

[tay1orjones]

Raised in slack

Even though persist() is available and just a noop in later versions of react that don't have event pooling anymore, we still need to guard calls to these. It was pointed out that if we begin to call persist(), it can break tests where event handlers are mocked. Example:

On our app we mock onChange function passed to the textArea like:

let onChange = jest.fn();
    let component = getComponent('hello', onChange);
    component
      .find('textarea')
      .props()
      .onChange({ target: { value: '   test123' }, persist: jest.fn() });

I had to add persist: jest.fn() into this bcs of that change

Changelog

Changed

• modify all event.persist() calls to be guarded via event?.persist?.();

References

• https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Optional_chaining#optional_chaining_with_function_calls

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[darq37]

LGTM

[guidari]

LGTM!