Enable full regression tests in the CI

[lebrice]

• Re-enables the reproducibility tests for algorithms and datamodules in the CI
• Moves the regression files to a different folder (.regression_files) instead of placing them next to the source code.
• [x] Add an entry in the "files.exclude" entry of the vscode settings for this new ".regression_files" folder.

Signed-off-by: Fabrice Normandin normandf@mila.quebec