chore: update @twilio/voice-react-native-sdk to 1.0.0-rc7

[mhuynh5757]

Submission Checklist

• [x] The CHANGELOG.md reflects any feature, bug fixes, or known issues made in the source code
• [x] New unit tests and integration tests have beed added
• [x] Code coverage is more or equal to the previous coverage
• [x] A visual inspection of the Files changed tab was made prior to submitting the pull request ensuring the style guide was followed
• [ ] CI pipeline is green
• [ ] Included screenshot if necessary

Description

This PR updates the Reference App to use 1.0.0-rc7 of the @twilio/voice-react-native-sdk. This PR also uses a new API introduced in the RN SDK to initialize the PushKit registry.

Breakdown

• Update RN SDK dependency version.
• New action for initializing the PushKit registry.
• Unit tests.

Validation

• New unit tests.
• Manual testing on iOS and Android.

Additional Notes

Other new APIs introduced with 1.0.0-rc7 will be used/implemented in a future PR.

Contributing to Twilio

All third-party contributors acknowledge that any contributions they provide will be made under the same open-source license that the open-source project is provided under.

• [x] I acknowledge that all my contributions will be made under the project's license.