Mass button migration

Executed with:

    comby \
        -config ~/dev/pajamas-adoption-scanner/comby/button-2.toml \
        -custom-matcher ~/dev/pajamas-adoption-scanner/comby/haml.json \
        -matcher .generic -in-place \
        -f .haml

Using the `button-migration` branch of the Pajamas Adoption Scanner:
https://gitlab.com/gitlab-org/frontend/pajamas-adoption-scanner/-/commits/button-migration