[Unit test] Several external links are not mocked during unit test

[ndegendogo]

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• Bug is not mentioned in the FAQ
• Bug is specific for iOS only, for general issues / questions that apply to iOS and Android please raise them in the documentation repository
• Bug is not already reported in another issue

Technical details

• Device name: Xcode simulator / iPhone 8
• iOS version: Xcode simulator / iOS 15
• App version: current latest under development / branch release/2.15.x

Describe the bug

In the unit tests for UITesting, the external links are usually mocked. They don't open the given URL, but show a message box instead. The reason for this mock is to reduce external dependencies, especially to the network infrastructure, and to make the unit tests more robust.

However, during analysis of #2179 I found several links that are not mocked in the unit test.
To be more precise, I found the following:

• informations in easy language and sign language from App information / About the app - AppStrings.AppInformation.aboutLink
• contact form on the Imprint page - AppStrings.AppInformation.imprintSectionContactFormLink
• link to the Blog from info page for statistics tiles - AppStrings.Links.statisticsInfoBlog
• FAQ from notification settings (only with active notifications) - AppStrings.Links.notificationSettingsFAQ
• FAQ from info page for the QR code of a vaccination certificate - AppStrings.CovPass.Information.faqLink
• two links from health certificate, scroll down to the bottom - "https://reopen.europa.eu/de" and "https://reopen.europa.eu/en"
• another two links from certificate validation info page - AppStrings.Links.healthCertificateValidationFAQ and AppStrings.Links.healthCertificateValidationEU
• FAQ for booster vaccination - AppStrings.Links.healthCertificateBoosterFAQ

Steps to reproduce the issue

• Use one of the two tricks at [Debugging Trick] Use Build Scheme ENAScreenshots with specific Launch Arguments to test the user interface on the simulator #3804 to execute cwa on the simulator in unit test mode (with mocks active).
• open one of the given pages
• click on the given link
  Expected: network access is mocked, the URL is shown on a message
  Observed: the URL opens

Expected behaviour

During unit testing, the links should be mocked. This will increase robustness of the unit tests

Possible Fix

Additional context

I am volunteering to submit a PR with a fix.

[ndegendogo]

@dsarkar I have prepared PR #3877 with a fix - please apply the labels.
Thanks!

[ndegendogo]

The PR was expected and is already merged.
Closing as fixed.