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

[jaeopt]

Summary

This PR updates the Python SDK to exclude CMAB (Contextual Multi-Armed Bandit) experiments from UserProfileService (UPS) for sticky bucketing.

Reason: CMAB experiments require dynamic decisions based on real-time context and user attributes. UPS maintains decisions across the experiment lifetime without considering TTL or attribute changes, which contradicts CMAB's dynamic nature.

Changes

Core Changes

• Skip UPS lookup for CMAB experiments - Decision service now checks if experiment is CMAB before looking up stored variation
• Skip UPS update for CMAB experiments - Decision service now checks if experiment is CMAB before updating user profile
• Add UPS exclusion to decision reasons - Decision reasons now include "Skipped UPS lookup/update for CMAB experiment as it requires dynamic decisions"

Test Coverage

• Added comprehensive test test_get_variation_cmab_experiment_skips_user_profile_service to verify:
  • UPS lookup is skipped for CMAB experiments
  • UPS update is skipped for CMAB experiments
  • Decision reasons include UPS exclusion messages
  • User profile tracker methods are not called for CMAB

Testing

Run the test suite to verify:

python -m pytest tests/test_decision_service.py::DecisionServiceTest::test_get_variation_cmab_experiment_skips_user_profile_service -v

Related

• Jira: FSSDK-12262
• Product Decision: Product team has agreed to exclude CMAB from UPS across all SDKs

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