Prepare 0.7.2 release - Githubissues

Remaining action items (checklist for patchlevel release):

[ ] Test all tutorial notebooks on a hardware backend
[x] Update version [sub]string in all files where it appears in the repository
- [x] pyproject.toml
[x] move release notes to 0.7 directory
[x] merge everything except this PR on the 0.7.2 milestone
[x] double check that all recent PRs with stable backport potential have been backported.
[x] build docs locally; proofread the release notes
[x] merge this PR
[x] tag the release
1. git checkout stable/0.7
2. git pull
3. git show (verify it's the commit we want to tag)
4. git tag -a 0.7.2 -m "Circuit Knitting Toolbox 0.7.2"
5. git show (double/triple check the tag is on the correct branch)
6. git push origin 0.7.2
[x] Wait for CI to finish. The release should then be available on GitHub and pypi.
[x] get docs to deploy (should happen automatically at this point after CI runs both on stable/0.7 and then on the gh-pages branch)
[x] move remaining 0.7.2 milestone items to 0.7.3 milestone and close 0.7.2 milestone

Previous patchlevel release PR: #566

Qiskit-Extensions / circuit-knitting-toolbox