Add DANRA tutorial notebook with pytest-nbmake

[GiGiKoneti]

Describe your changes

This PR takes over the work of PR #577 and Issue #69 to add the hello_world_danra.ipynb tutorial notebook.
It resolves all remaining review comments from @sadamov:

1. Cell 17 (graph visualization): Replaces the oversized interactive plotly output (which caused the notebook to hang) with a lightweight, filtered display inline and writes the full interactive graph to graph_viz.html.
2. Cell 17 (load_graph updates): Updated the python code in the cell to pass the required mesh_node_features_scaling parameter (matching the new graph format specification).
3. Changelog Consolidation: Consolidated all PR 577 changelog entries into a single entry under the ## [unreleased] block, cleaning up duplicate headers in the frozen v0.6.0 release.

Issue Link

closes #69
refs #577

Type of change

• 🐛 Bug fix (non-breaking change that fixes an issue)
• ✨ New feature (non-breaking change that adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
• 📖 Documentation (Addition or improvements to documentation)

Checklist before requesting a review

• My branch is up-to-date with the target branch - if not update your fork with the changes from the target branch (use pull with --rebase option if possible).
• I have performed a self-review of my code
• For any new/modified functions/classes I have added docstrings that clearly describe its purpose, expected inputs and returned values
• I have placed in-line comments to clarify the intent of any hard-to-understand passages of my code
• I have updated the README to cover introduced code changes (no README changes needed for this onboarding notebook update)
• I have added tests that prove my fix is effective or that my feature works
• I have given the PR a name that clearly describes the change, written in imperative form.
• I have requested a reviewer and an assignee (assignee is responsible for merging). This applies only if you have write access to the repo, otherwise feel free to tag a maintainer to add a reviewer and assignee.

Checklist for reviewers

• the code is readable
• the code is well tested
• the code is documented (including return types and parameters)
• the code is easy to maintain

Author checklist after completed review

• I have added a line to the CHANGELOG describing this change, in a section reflecting type of change:
  • added: - Add hello_world_danra.ipynb... under ## [unreleased]

[sadamov]

@GiGiKoneti my bad, I thought there was much more to do, but actually there were only few remaining issues because of recent main mergers. Closing again...