Issue number: internal
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## What is the current behavior?
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The keyboard navigation tests for radio were disable due to flakiness
with Safari when it came to the CI.
## What is the new behavior?
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this PR. -->
- Re-enabled the tests.
Debugging was done with a saved artifact.
The artifact didn't provide a clear reason of why it flakes. But it did
seem that the test was tabbing before the Safari page finished loading.
I've added a `waitFor()` to verify that the radios have rendered. This
was done for Safari only to prevent any additional wait time.
## Does this introduce a breaking change?
- [ ] Yes
- [x] No
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## Other information
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screenshots of how the component looks before and after the change. -->
There is no great way to test this since it only flakes on GitHub.
204a861b27