refactor: Moving and adding some test helpers for `stack reorder`

Gary Holtzrequested to merge
7472-add-reordering-of-diffs-inside-a-stack-part-2 into main

Description

Moves a lot of the http mocks to public methods so they can be reused for this MR feat: Add reordering of stacks (!1814 - merged)

Types of changes

  • Bug fix (non-breaking change which fixes an issue)
  • New feature (non-breaking change which adds functionality)
  • Breaking change (fix or feature that would cause existing functionality to change)
  • Documentation
  • Chore (Related to CI or Packaging to platforms)
  • Test gap

Closes #7472 (closed)

Edited by Gary Holtz

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