Fix stuck on verifiying phone number in case of invalid E.164 format

[gmchandarana]

First time contributor checklist

• [x] I have read the README and CONTRIBUTING documents
• [x] I have signed the Contributor Licence Agreement

Contributor checklist

• [x] My commits are rebased on the latest main branch

• [x] My commits are in nice logical chunks

• [x] My contribution is fully baked and is ready to be merged as is

• [x] I have tested my contribution on these devices:

  • iPhone 13 Pro, iOS 17.3
  • iPhone 12 Simulator, iOS 15.2

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PROBLEM:

Upon attempting registration with a seemingly valid phone number format, such as +44 07XX XXXXXX, the server responds with a status code 422. Subsequently, an alert is presented to the user. However, upon acknowledgement of this alert by the user, the registration process stalls at the stage labelled "Verifying +44 07XX XXXXXX" screen. See #5609 for more details.

FIX:

I fixed the issue by introducing a method on the RegistrationPhoneNumberPresenter protocol. This function is invoked when the user taps the ok button on the Invalid Phone Number alert.

TEST:

The following was tested on iPhone 13 Pro (iOS 17.3), iPhone 15 Pro Simulator (iOS 17.0) and iPhone 12 Simulator ( iOS 15.2):

• The "Verifying +44 07XX XXXXXX" screen is dismissed and the user lands back on the "Your Phone Number" screen.
• The label under the phone number text field (validationWarningLabel) reads "Invalid phone number. Please enter a valid phone number to register" in the ows_accentRed color.

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