projects: refactor back into a single file
Have projects definition on a single file again.
The previous to refactor to have a directory per deployment was never really the desired end state, because we are not anticipating storing a lot of custom resources per projects.
If we do, we can always create a dedicated directory anyway.
Bug: T375283 Signed-off-by: Arturo Borrero Gonzalez aborrero@wikimedia.org