return 404 when stage extras for an unversioned course url are requested #29043
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Background
Fixes https://app.honeybadger.io/projects/3240/faults/50002356
Investigation into the honeybadger error revealed that they all had one of the following two settings in the "parameters" section:
Internet research revealed that these search engine crawlers will keep requesting urls that return a 5xx, and need to receive a 404 or 410 in order to be told to stop requesting them.
Description
Return 404 for any request to an unversioned stage extras url such as those listed in the honeybadger events.