chore(*): update codegen for Concerto v4 compatibility

[muhabdulkadir]

Closes #

Concerto v4 Compatibility Update for Codegen

This PR updates concerto-codegen to work with Concerto Core v4.

Key Changes

• Namespace Versioning: All test models now use versioned namespaces
• Removed Unversioned Test: Removed test for unversioned namespaces (no longer supported in v4)
• Protobuf Test Refactor: Replaced remote model loading with local minimal models to avoid v3 compatibility conflicts
• TypeScript Unions: Updated to use serializer-based validation instead of the deprecated Concerto constructor
• Snapshot Updates: Regenerated all snapshots reflecting versioned namespace outputs
• Dependency Change: Moved Concerto dependencies to peerDependencies (v4 compatibility)

Breaking Changes

This is a v4 major version bump. Code using these packages must:

1. Update all model namespaces to versioned format
2. Declare concerto version "^4.0.0" or compatible version
3. Update imports to reference versioned namespaces

Screenshots or Video

Related Issues

• Issue #
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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

[jamieshorten]

Why are we deleting these?

[muhabdulkadir]

v4 enforces strict mode, so unversioned models are no longer compatible.