use react-is in pretty-format

[mishra-prabhakar]

Summary

Use react-is instead of manual element type checks in pretty-format.

Fixes #7895

Test plan

Existing tests should suffice, as there is no functionality change.

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[SimenB]

@Prabhakar-17 seems like 3 tests in packages/pretty-format/src/__tests__/react.test.tsx is failing - could you take a look?

[SimenB]

Thanks! Left some inline comments.

Please update the changelog (and fix CI 🙂)

[SimenB]

You can look at #8058 for how to fix it 🙂

[mishra-prabhakar]

@SimenB Finally all checks have passed and fixed the CI as well :)
Please take a look. Thanks

[SimenB]

Thanks @Prabhakar-17!

[mishra-prabhakar]

Thanks @SimenB for the patience and the help. This is my first successful PR, looking forward to having many more :)

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