fix(robot-server): dont let /instruments block #14608
Merged
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It calls cache_instruments and that can block because it takes the motion lock, but we really don't want that. We don't mind if cache_instruments doesn't get called on the flex because it's sort of a secondary functionality, so just bail early in this case.
Testing
GET /instruments
while things are homign and note that it instantly returnsCloses EXEC-298