test : added unit tests for redis_cache service

[tmdeveloper007]

Refs #814.

Summary of What Has Been Done:
Added comprehensive unit tests for the redis_cache.py service. The tests cover the RedisInferenceCache class with 36 test cases across helper functions and all cache operations.

Changes Made:

• Created backend/tests/test_redis_cache_new.py with 36 test cases covering:
  • _truthy: all truthy/falsy string variations
  • _text_key: md5 hashing, case normalization, whitespace handling, empty text
  • RedisInferenceCache.init: env var parsing, truthy/falsy values
  • available property: enabled/disabled states
  • connect: disabled, successful connection, failure with/without degraded mode
  • get_classification / set_classification: hits, misses, errors, unavailable states
  • get_embedding / set_embedding: hits with float conversion, misses, errors
• Updated backend/tests/conftest.py to skip this test file from main.py import (which has a pre-existing syntax error)

Impact it Made:
This adds test coverage for the Redis caching layer, ensuring graceful degradation works correctly when Redis is unavailable and cache operations behave correctly across different states.

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