Ref #4879: VPN churn improvements - VerifyReceiptData fields with isBillingRetry

[soner-yuksel]

Summary of Changes

Second part Pr for VPN Churn improvement. After #7670 added Pop-over types and new style of displaying the pop-overs.

This PR is adding fixes for proper priority for Callouts and method for displaying update billing pop over.

In addition main part is implementation of verifyReceiptData function which is right now only used in AppLaunch which can retrieve all details of receipt.

The tests are added for receipt field different variation.

There will be a 3 rd Pr after this to combine menu changes and popover UX depending on this PR. But this Pr can be merged when review is finished and application works as expected with the change of verifyReceipt data functions

This pull request fixes #4879

Submitter Checklist:

• Unit Tests are updated to cover new or changed functionality
• User-facing strings use NSLocalizableString()
• New or updated UI has been tested across:
  • Light & dark mode
  • Different size classes (iPhone, landscape, iPad)
  • Different dynamic type sizes

Test Plan:

N/A

Reviewer Checklist:

• Issues include necessary QA labels:
  • QA/(Yes|No)
  • bug / enhancement
• Necessary security reviews have taken place.
• Adequate unit test coverage exists to prevent regressions.
• Adequate test plan exists for QA to validate (if applicable).
• Issue and pull request is assigned to a milestone (should happen at merge time).