[AI-FSSDK] (DO NOT REVIEW) [FSSDK-12262] Exclude CMAB from UserProfileService

[jaeopt]

Summary

Exclude CMAB (Contextual Multi-Armed Bandit) experiments from User Profile Service (UPS) to ensure dynamic decision-making that respects TTL and user attributes.

Related Ticket

FSSDK-12262

Changes

• Skip UPS lookup for CMAB experiments: Modified get_variation to check is_cmab_experiment before retrieving stored variations
• Skip UPS save for CMAB experiments: Modified get_variation to check is_cmab_experiment before saving new decisions
• Add decision reason: When UPS is skipped for CMAB, add message "User Profile Service is not used for CMAB experiments" to decision reasons
• Add test coverage: New test verifies UPS is bypassed for CMAB (lookup and save)

Why This Change?

UPS maintains decisions across the experiment lifetime without considering TTL or user attributes, which contradicts CMAB's dynamic nature. CMAB experiments need to make fresh decisions on each call to respond to changing contexts.

Testing

• ✅ Code changes follow Ruby SDK patterns and mirror Python SDK implementation
• ✅ New test added to verify UPS exclusion for CMAB experiments
• Note: Tests require Ruby 3.0+ to run (current local environment has Ruby 2.7.4)

Acceptance Criteria

• ✅ Update SDK to exclude CMAB from UPS
• ✅ Add UPS exclusion to decision reason

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