Revert "nixos/tests/docker-tools*: remove useless formatter"

Annoyed with the interference of the python formatting of
generated code (see #72964), I took matters into my own hands
as maintainer of dockerTools.

Afterwards, I've created a PR, hoping to unstuck the discussion.

@aszlig took notice and thanks to his python ecosystem knowledge,
the testing efforts of @blaggacao and @Ma27, and a sense of
shared suffering and comraderie we were able to change the
situation for the better in #122201.

Now, we have a proper linter that actually helps contributors,
so it's time to turn it back on again.

I'm glad we could make it happen this quickly!

Thanks!

This reverts commit 4035049af3e45554ffc4d8b4c30fd43ae9cd328a.

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