fix(plugin/habits): respect skipped-repositories

[lowlighter]

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Discussed in https://github.com/lowlighter/metrics/discussions/1144

^{Originally posted by revilowaldow July 21, 2022} The habits plugin doesn’t seem to respect skipped repositories when generating facts. It’s thinking that I only use spaces and always commit on a Thursday afternoon because I just did a load of setting up this tool (which is great btw 😘). I’ve got skipped repositories excluding my homepage repo but it still seems to be using those commits. The suggestion is to ignore any commits from the excluded repos list when calculating habits from commits