Fix: App Fetch Compatibility for Older SC Versions

[victorkl400]

Description

This PR updates the app fetching logic to check response for unendorsed apps which ensure compatibility with older smart contract versions that do not support endorsements.

Fixes #62

Type of change

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• My code follows the coding standards of this project
• I have performed a self-review of my code
• I have commented on my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• New and existing integration tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have not added any vulnerable dependencies to my code

Screen Recording

Mainnet (X2EarnApps V3)

Screen.Recording.2025-01-31.at.11.51.15.mov

Testnet (X2EarnApps V1)

Screen.Recording.2025-01-31.at.11.51.55.mov

[Agilulfo1820]

Pushed a commit to not show vbd apps on testnet