network-score: Add tests for UnauthorizedOperation

[Vaibhavsahu2810]

Fixes #294

Description

This PR adds a test case to verify that rating revocations are properly authorized. The test ensures that a rating can only be revoked using the authorization ID that was used to create it, preventing unauthorized operations.

Implementation

• Creates two spaces with different authorization IDs
• Registers a rating using the first authorization ID
• Attempts to revoke the rating using the second authorization ID
• Verifies that the operation fails with an UnauthorizedOperation error

Testing

• All new tests can be executed using cargo test -p pallet-asset
• Test cases validate proper error handling

Below is the attached screenshot of the test case passing in the local environment:-

[Vaibhavsahu2810]

Hello @vatsa287 , can you review this pr?