Remove `GH::TokenCheck` from GH call stack

While checking the validity of the token we are going to use is
a good idea, it seems that we are making quite a few of them,
consuming a lot of API calls, often unnecessarily.

It is possible to memoize a token's validity for some time in Redis,
if we want to still check it.

Hiro Asari authored and committed

Nothing here #2048.1 failed

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