fix: Sort nested sub-tasks by start/due date in list and spreadsheet

[karthiksuki]

Description

Sort nested sub-tasks by start/due date in list and spreadsheet blocks

Fix: #9101

Type of Change

• [x ] Bug fix (non-breaking change which fixes an issue)
• Feature (non-breaking change which adds functionality)
• Improvement (change that would cause existing functionality to not work as expected)
• Code refactoring
• Performance improvements
• Documentation update

Screenshots and Media (if applicable)

Test Scenarios

1. Sort by ascending and descending order, sub-tasks go with the flow properly

[CLAassistant]

All committers have signed the CLA.

[coderabbitai]

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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