Follow-up from "Migrates LabelsSelect to LabelsSelectWidget in TestCaseSidebar and fixes bug"

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The following discussion from !109527 (merged) should be addressed:

• @rcrespo3 started a discussion: (+2 comments)

  @fguibert The proper architecture should actually be as follows.

• Duplicate issuableLabelsQueries object into ee/app/assets/javascripts/sidebar/constants.js
• Since it's in the ee folder, it shouldn't be a problem to import ee queries there.
• Update issuableLabelsQueries import in app/assets/javascripts/sidebar/components/labels/labels_select_widget/labels_select_root.vue to use ee_else_ce so the appropriate version gets loaded.

Note that epics query should follow this architecture and the existing issuableLabelsQueries object should only contain queries for issues and merge requests. A possible way to approach this is to follow the easy solution with the existing architecture in this MR and fix the ce/ee separation in a follow up MR.