fix: predicate for updating conversations with backend - WPB-22241 🍒

[github-actions]

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

• fix: predicate for updating conversations with backend - WPB-22241 #3988

Original PR description:

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WPB-22241 [iOS] Don't schedule update conversation calls for deleted conversations

Issue

Right now, it can happen that the ConversationUpdatesGenerator generates workItem on deleted conversations. This PR fixes this in filtering out deleted conversations.

Testing

See test case

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.

[zenkins]

✅ Auto-approved cherry-pick PR 🍒.

[github-actions]

Test Results

    3 files    499 suites   18m 50s ⏱️
4 051 tests 4 050 ✅ 0 💤 1 ❌
4 052 runs  4 052 ✅ 0 💤 0 ❌

For more details on these failures, see this check.

Results for commit 7c6e16e.