The service-side TrafficStats rate limit cache is no longer needed as
client-side caching is now solely responsible for rate-limiting traffic
stats queries.
This commit removes:
- The `clearTrafficStatsRateLimitCaches` AIDL method.
- The service-side cache implementation, including member variables and
logic within `NetworkStatsService`.
- Related feature flags and constants used for the service-side cache.
- All unit tests specifically for the service-side cache.
This simplifies the overall traffic statistics caching architecture by
centralizing rate-limiting responsibility on the client side.
Flag: EXEMPT refactoring
Test: atest ConnectivityCoverageTests --test-filter '.*NetworkStats.*' --update-device
Test: atest ConnectivityCoverageTests --test-filter '.*TrafficStats.*' --update-device
Fix: 428098676
Fix: 428097311
Change-Id: I41cbb80a52f04dcf387c3352677a91cb692ffe73
e9eb8e2b8a