Filter Redis sessions from cache hit/miss rate

[Litarnus]

When using Redis for sessions, it will show up in the cache hit/miss ratio. If there are many single visitors or bots, it will report a lot of cache misses which will make the cache module not very useful for regular caching statistics.

We should not include session related informations as they can make the entire cache statistics useless

[linear]

LARAVEL-52

[stayallive]

I'm not sure entirely removing it is the way to go either. What if we rename the spans to use the session prefix instead? This should remove it from cache analytics but not remove it from a trace. Sounds like a plan?