CPLAT-4460: Make compatible for use with react.dart 5.0.0-wip

[kealjones-wk]

Ultimate problem:

react_dom.render changed its functionality in react 16.

How it was fixed:

• remove react_dom.render element throw test since it no longer throws with null passed as the element.

Testing suggestions:

• CI Passes
• All tests should pass locally with react-dart 5.0.0-wip branch:

dependency_overrides:
  react:
    git:
      url: git@github.com:cleandart/react-dart.git
      ref: 5.0.0-wip

Then run pub run build_runner test -r --delete-conflicting-outputs -- -P dart2js

Potential areas of regression:

Maybe?

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FYA: @greglittlefield-wf @aaronlademann-wf @kealjones-wk @evanweible-wf @maxwellpeterson-wf

[aviary-wf]

Security Insights

No security relevant content was detected by automated scans.

Action Items

• Review PR for security impact; comment "security review required" if needed or unsure
• Verify aviary.yaml coverage of security relevant code

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Questions or Comments? Reach out on Slack: #support-infosec.

[greglittlefield-wf]

• CI passes
• All tests pass w/ the latest 5.0.0-wip in both DDC and dart2js

+10

[joebingham-wk]

Not sure if @aaronlademann-wf wants to do a check, but looks good to me. +1

[kealjones-wk]

These were changed to callback refs because string refs are considered legacy and will be deprecated eventually

[greglittlefield-wf]

+10

@Workiva/release-management-pp