Suisin/sign up country code dropdown

[suisin-deriv]

Changes:

This PR is to implement country code dropdown behind a feature flag for real account sign up

Screenshots:

CR

EU

[vercel]

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Name	Status	Preview	Updated (UTC)
deriv-app	✅ Ready (Inspect)	Visit Preview	Feb 19, 2025 11:28am

[github-actions]

A production App ID was automatically generated for this PR. (log)

• PR: Suisin/sign up country code dropdown #18058
• URLs:
  • w/ App ID + Server: https://deriv-app-git-fork-suisin-deriv-suisin-signupcountrycode-23249c.binary.sx?qa_server=red.derivws.com&app_id=31898
  • Original: https://deriv-app-git-fork-suisin-deriv-suisin-signupcountrycode-23249c.binary.sx
• App ID: 31898

Click here to copy & paste above information.

- **PR**: [https://github.com/deriv-com/deriv-app/pull/18058](https://github.com/deriv-com/deriv-app/pull/18058)
- **URLs**:
    - **w/ App ID + Server**: https://deriv-app-git-fork-suisin-deriv-suisin-signupcountrycode-23249c.binary.sx?qa_server=red.derivws.com&app_id=31898
    - **Original**: https://deriv-app-git-fork-suisin-deriv-suisin-signupcountrycode-23249c.binary.sx
- **App ID**: `31898`

[github-actions]

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