feat: make syncV2 available for apiVersion 7 - WPB-21456 🍒

[github-actions]

This PR was automatically cherry-picked based on the following PR:

• feat: make syncV2 available for apiVersion 7 - WPB-21456 #3811

Original PR description:

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WPB-21456 [iOS] Make syncV2 available for apiVersion 7

Issue

In order to deprecate legacy sync, we need to make syncV2 available to supported versions below 8: 5, 6, 7.

This PR makes it available for apiVersion 7

• Add constant for syncV2 check
• Remove dead code
• [TMP] run critical flows with apiVersion 7

Testing

1. Set preferredAPIVersion to v7
2. login
   check for (parsing) errors

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Checklist

• Title contains a reference JIRA issue number like [WPB-XXX].
• Description is filled and free of optional paragraphs.
• Adds/updates automated tests.

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UI accessibility checklist

If your PR includes UI changes, please utilize this checklist:

• Make sure you use the API for UI elements that support large fonts.
• All colors are taken from WireDesign.ColorTheme or constructed using WireDesign.BaseColorPalette.
• New UI elements have Accessibility strings for VoiceOver.

[netbe]

🍒

[github-actions]

Test Results

3 535 tests   3 508 ✅  4m 28s ⏱️
  488 suites     27 💤
    4 files        0 ❌

Results for commit eb1376b.