fix(cli): filter out None values to preserve method defaults

[rjgoyln]

Summary

In the current Task SDK CLI auto-generation mechanism, when a user executes a command without providing optional primitive flags (e.g., --limit or --state), the CLI parser captures these as explicit None values.

Change

• Optimized cli_config.py to filter None values, preserving native method defaults while allowing 0 or False.
• Enhanced parameter mapping and added unit tests for fallback behavior, manual overrides, and edge cases.

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