Remove all C++ Telemetry Accumulation calls.

This creates a number of stubs and leaves some surrounding code that may be irrelevant (eg. recorded time stamps, status variables).
Stub resolution/removal should be a follow-up to this.

netwerk/cache2/CacheIndex.cpp

@@ -3757,7 +3757,6 @@ ReportHashSizeMatch(const SHA1Sum::Hash *aHash1, const SHA1Sum::Hash *aHash2)
       bitsDiff++;
 
       uint8_t hashSizeMatch = debruijn32[bitsDiff*0x076be629>>27] + (i<<5);
-      Telemetry::Accumulate(Telemetry::NETWORK_CACHE_HASH_STATS, hashSizeMatch);
 
       return;
     }