refactor: create local stores and UTS - WPB-12100

[jullianm]

WPB-12100 [iOS] Create remaining local stores and add UTs for all stores

Key points

This PR isolates tests for our storage layer (local stores) and revisits tests for all our existing repositories.
Missing local stores were also created so the storage logic could be moved out from related repositories.

BEFORE:

• Local stores were indirectly tested through our repositories

AFTER:

• Each local store is directly tested.
• Mock local stores are injected into repositories, repositories tests were revisited consequently.

In addition:

• Removes super.setUp() and super.tearDown() code from all tests
• Ensures local stores know nothing about API objects (using model mappers)
• Uses .mockID instances from WireTestingPackage
• Harmonizes tests naming

Testing

• Add dedicated tests for all local stores
• Revisit repositories tests

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.

[github-actions]

Test Results

    8 files    934 suites   13m 18s ⏱️
7 584 tests 7 584 ✅ 0 💤 0 ❌
7 592 runs  7 592 ✅ 0 💤 0 ❌

Results for commit 59991d3.

♻️ This comment has been updated with latest results.

[netbe]

LGTM;)