chore(nns,sns): release v0.7.0

[github-actions]

PR created by this workflow: https://github.com/dfinity/dfx-extensions/actions/runs/19171032559
Link to release: https://github.com/https://github.com/dfinity/dfx-extensions/releases/tag/nns-v0.7.0
After merging, run the following:

git checkout main
git pull
cargo dist plan
cargo release -p nns --execute