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[Backport 3.6] Move test helper code to the framework repo
Trivial 3.6 backport of #8992
PR checklist
Please tick as appropriate and edit the reasons (e.g.: "backport: not needed because this is a new feature")
- [x] changelog not required - internal change only
- [x] 3.6 backport of #8992
- [x] 2.28 backport not required - no framework submodule in 2.28
- [x] tests not required - internal file moves only