Twined

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Operations
- [x] Unify skip commands in CI/CD workflows
- [x] Update usage of release notes compiler in workflow
- [x] Fix `mkver.conf` file so it keeps versions below `1.0.0` (i.e. keeps the package in beta)

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Operations
- [x] Use new PR description workflow
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Operations
- [x] Use `conventional-commits` repo for CI checks

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Operations
- [x] Use LAST_RELEASE mode when compiling release notes

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Operations
- [x] Add missing `mkver.conf`

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Operations
- [x] Run `release` workflow on merge of any branch into `main`
- [x] Add [Conventional Commits](https://www.conventionalcommits.org/en/v1.0.0/) `pre-commit` hook
- [x] Replace `check-version-consistency` job with `check-semantic-version` job, which checks that the version in `setup.py` is the same as the semantic version expected by `git-mkver` given the Conventional Commits since the last tag
- [x] Add the `update-pull-request` workflow that auto-generates part of the PR description on each commit
- [x] Run `publish` test job on all branches and make it dependent on `check-semantic-version` job passing
- [x] Rename `tests` job to `run-tests`