Remove tenant header logs in store gateway

[yeya24]

• I added CHANGELOG entry for this change.
• Change is not relevant to the end user.

Changes

It is very verbose to have a separate log line to log tenant for every requests in store gateway, especially for Cortex which uses store gateway as a library. It doesn't propagate Thanos header at all so no need to have the warning log for missing headers.

Verification

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[saswatamcode]

LGTM!
We might need to add this back in the future, if we start to rely on tenant labels heavily here. cc: @jacobbaungard

[yeya24]

We might need to add this back in the future, if we start to rely on tenant labels heavily here

I think we can add tenant header along side with other logs. But warning log sounds unnecessary to me. Same for the debugging log for the tenant id itself. It really doesn't provide much information overall.
If really needed, can we add that log in querier instead? Store Gateway should be fine as long as we know the gRPC metadata propagation works as expected.

[saswatamcode]

If really needed, can we add that log in querier instead?

Probably. Right now we aren't using this tenant information in StoreGW.