Move window.URL.createObjectURL = function createObjectURL() to separate file

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Move window.URL.createObjectURL = function createObjectURL() out of test_setup.js into its own thing. Please view conversation below for more details.

The following discussion from gitlab-ce!32571 should be addressed:

• @winh started a discussion: (+2 comments)

  I wonder if we should start pulling things out of this file into smaller ones.