refactor(phone-input): use Intl for country names instead of hardcoding

[LuLaValva]

Description

• With current phone-input, we require bundle to include a list of all country names in a given locale. This is unnecessary because Intl already provides this functionality.

Context

• A team was unable to make backend changes to get a list of country names, and I realized that they really shouldn't have to because we can use the browser for this instead

Note

• Previously, it was possible to refrain from including certain countries from the list. This is no longer possible, but I think that is a good change. We should support all country codes.

Screenshots

References

#2197

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Latest commit: b45cdae

The changes in this PR will be included in the next version bump.

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Name	Type
@ebay/ebayui-core	Major

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