Code that disables object storage for the export rake task is ever-so-racy

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The following discussion from !30637 (merged) should be addressed:

• @nick.thomas started a discussion: (+1 comment)

  This is ever-so-racy 😬

  It doesn't matter so much, since we only ever use it in a single-threaded context, but this file and class are not obviously rake-only. Can we have a follow-up issue to fix this?