~ Move test designs to a separate repository and add it as a submodule.
~ Adjust test set to refer to designs in submodule.
~ Change design_dir in `run_tests.py` for artifact upload in the CI.
~ Fix fail condition on design name mismatch in `compare_regression_reports.py`
~ Print a better error message for design name mismatch mentioned previously.
~ Change regression benchmark to point reflect submodule change.
~ Change documentation to reflect new paths of designs.
+ Add aes_user_project_wrapper to ci designs to test EXTRA_SPEFS.
+ Add a step in CI workflow to replace `/` with `_` in design name for artifact upload.
