It's started at "(while i'm in the repository ¯\_(ツ)_/¯)"...
In the process, some more stuff needed to be done:
- drop the symbolic links on the tests data resource folder which would not agree with setuptools-scm otherwise [1]
- add mypy stanza to ignore tenacity stuff (so i could commit)
[1] https://forge.softwareheritage.org/D3458#84993
Related to T2105