test(serialization): add shape command v2 deserialization coverage

[DevAnuragT]

PR Description

Jira ticket: NA
Jira link: NA

Summary

This PR adds backward-compatibility unit test coverage for shape command deserialization when version is set to v2.

Scope:

• Test-only changes
• No production serializer behavior changes
• No UI or feature logic changes

New Features and Enhancements

• Added v2 deserialization coverage for:
  • Square shape command serializer tests
  • Star shape command serializer tests
  • Heart shape command serializer tests
  • Ellipse shape command serializer tests

Refactorings and Bug Fixes

• None in production code.
• This PR focuses on regression safety and compatibility confidence through tests.

Validation

• Ran targeted tests for all updated shape serializer test files
• Ran serialization command test suite locally
• All passed locally

Checklist

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