Co-authored-by: Renovate Bot <bot@renovateapp.com>
Co-authored-by: Michael Kriese <michael.kriese@visualon.de>
Co-authored-by: Jamie Magee <JamieMagee@users.noreply.github.com>

Also convert usage of chai to jest

This reverts commit b5c9dc8e.

feat: unify file locations

- Refactor: move fixtures to corresponding directories
- Delete unused fixtures

Resolves: #3328 

Adds automatic memcaching of datasource releases results per-repo.

Closes #2466