if the record_results endpoint fails, don't fail the job
if the record_results endpoint fails, don't fail the job

Summary:
A request to record_results failed, which caused a folly gcc 8 build
regression to slip in, which broke the Watchman and EdenFS builds.

Instead, turn record_results requests into a logged warning.

Reviewed By: xavierd

Differential Revision: D38170729

fbshipit-source-id: d59ae5fa48b5cbcf649281108d958ff95e319e35

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