feat(*): cleanup packages and references

[jonathan-casey]

This PR refactors the concerto repository - it was decided to move concerto-cli, concerto-metamodel & concerto-tools (now concerto-codegen) from the mono-repo, to their own repositories. As such, all Project references belonging to these packages are removed

Changes

• removed concerto-cli & refs
• removed concerto-metamodel & refs
• removed concerto-tools & refs

Related Issues

• Issue Repository restructuring #518

Author Checklist

• Ensure you provide a DCO sign-off for your commits using the --signoff option of git commit.
• Vital features and changes captured in unit and/or integration tests
• Commits messages follow AP format
• Extend the documentation, if necessary
• Merging to main from fork:branchname

[dselman]

Please don't forget we will also need to review the docs. E.g.
https://concerto.accordproject.org/docs/contributing