Add terra enzyme intl to jest config

[sdadn]

Summary

This PR adds terra-enzyme-intl to the Jest config for consistency with the existing global enzyme config and for better developer experience. Now, terra-enzyme-intl methods such as shadowWithIntlcan now be called globally in any jest test as enzymeIntl.shadowWithIntl without having to import the library in each file. Similarly, Enzyme methods such as mount can be called as enzyme.mount for improved clarification of the method's source library.

Testing

This change was tested using:

• WDIO
• Jest
• Visual testing (please attach a screenshot or recording)
• Other (please describe below)
• No tests are needed

Reviews

In addition to engineering reviews, this PR needs:

• UX review
• Accessibility review
• Functional review

Additional Details

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