Update notebook contributing guidelines

[RDaxini]

Describe your changes

See linked issue

Issue ticket number and link

Fixes #352

Type of change

Please delete options that are not relevant.

• This change requires a documentation update

Checklist before requesting a review

• I have performed a self-review of my code
• Code changes are covered by tests.
• Code changes have been evaluated for compatibility/integration with Scenario analysis (for future PRs)
• Code changes have been evaluated for compatibility/integration with geospatial autotemplating (for future PRs)
• New functions added to init.py
• API.rst is up to date, along with other sphinx docs pages
• Example notebooks are rerun and differences in results scrutinized
• What's new changelog has been updated in the docs

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.72%. Comparing base (5b76b1a) to head (0bc851b).
⚠️ Report is 48 commits behind head on development.

Additional details and impacted files

@@             Coverage Diff              @@
##           development     #353   +/-   ##
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  Coverage        74.72%   74.72%           
============================================
  Files               41       41           
  Lines             4823     4823           
============================================
  Hits              3604     3604           
  Misses            1219     1219           

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[Copilot]

Pull request overview

Updates the project’s documentation to correct guidance for contributing Jupyter notebooks, aligning it with the repository’s CI notebook validation approach (nbval) and the expectation that tutorial notebooks are committed with executed outputs.

Changes:

• Update contributing guidelines to instruct contributors to execute notebooks and commit outputs (instead of clearing them).
• Add explicit jupyter nbconvert --to notebook --execute --inplace instructions and guidance for handling non-reproducible outputs (via # NBVAL_IGNORE_OUTPUT).
• Add a release note entry documenting the contributing-guideline correction.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
docs/source/whatsnew/releases/v0.7.2.rst	Adds a release note documenting the corrected notebook contribution guidance and CI expectations.
docs/source/user_guide/contributing.rst	Updates notebook contribution instructions to commit executed outputs and provides rerun/nbval guidance.

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