chore: cleanup of iOS intl polyfills

[gkartalis]

This PR resolves PHIRE-209

Description

As a follow up on the react native upgrade of @araujobarret we don't need anymore the polyfills that were added to ensure smooth hermes operation on iOS anymore.

In react native 70 they added the necessary polyfills (read more on the hermes issue here and in this blogpost)

The issue before was that anything date related wasn't working properly before like sorting articles or mycollection articles weren't displayed but confirmed that they work correctly.

PR Checklist

• I have tested my changes on iOS and Android.
• I hid my changes behind a feature flag, or they don't need one.
• I have included screenshots or videos, or I have not changed the UI.
• I have added tests, or my changes don't require any.
• I added an app state migration, or my changes do not require one.
• I have documented any follow-up work that this PR will require, or it does not require any.
• I have added a changelog entry below, or my changes do not require one.

To the reviewers 👀

• I would like at least one of the reviewers to run this PR on the simulator or device.

Changelog updates

Changelog updates

Cross-platform user-facing changes

iOS user-facing changes

• cleanup of iOS intl polyfills - gkartalis

Android user-facing changes

Dev changes

Need help with something? Have a look at our docs, or get in touch with us.

[MrSltun]

🧹🧹🧹

[ArtsyOpenSource]

This PR contains the following changes:

• iOS user-facing changes (cleanup of iOS intl polyfills - gkartalis)

Generated by 🚫 dangerJS against a6cc1f1

[araujobarret]

giphy720p.mp4

[brainbicycle]

very nice ✨