[AI-FSSDK] [FSSDK-12750] Use attribute id instead of key for CMAB prediction requests

[raju-opti]

Summary

The CMAB prediction request payload was incorrectly sending the attribute's key instead of its id in the "id" field. The CMAB prediction endpoint expects the attribute id, not the key, so this fix ensures the correct identifier is used when building filtered attribute maps for CMAB experiments.

Changes

• Fix FilterAttributes in DefaultCmabService to use attribute id instead of key as the dictionary key
• Update CMAB service tests to verify attribute ids are used in filtered attribute maps
• Add explicit test case to confirm attribute id is used over attribute key

Jira Ticket

FSSDK-12750