[processor/tailsampling] Decision cache Put() should return ok bool #37300
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This pull-request changes the decision cache interface, updating
Put()to return an ok bool. The bool indicates if the cache put action was successful or done at all (e.g. nop). This is particularly useful when interacting with the nop cache, no longer need to follow a put w/ a get etc. This is also handy when implementing a cache that makes network calls, e.g. memcache.Related to #37035