fix(flutterChanelForConditionalNotif): In flutter, retrieve declared days and pass them to the platform channels

[lcubeddu]

Description

Retrieve declared days with http request in Flutter and pass them to the respective platform channels (Swift, Kotlin).

Linked Issues

Closes #1438

Changes

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Tests

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• [x] Manually
• [ ] Automated tests
• [ ] QA
• [ ] Other

Additional information

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[github-actions[bot]]

Label bug :bug: has been added to this pull request