refactor: refactor clean_projects to reduce redundancy in outputs

[tgilon]

Closes #804.

Changes proposed in this Pull Request

Tasks

Workflow

Open issues

Notes

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Checklist

Required:

• Security scans show no high-severity bugs, critical vulnerabilities, or exposed secrets.
• Changes are tested locally and behave as expected.
• Code and workflow changes are documented.
• A release note entry is added to doc/release_notes.md.
• The description is human-written and any AI-generated content is marked.

If applicable:

• Changes in configuration options are reflected in scripts/lib/validation.
• Changes in configuration options are added to config/test/*.yaml.
• Multiple climate years test passes locally (pixi run -e open-tyndp tyndp-cyears-test).
• For new data sources or versions, these instructions have been followed.
• Open-TYNDP SPDX license header is added to all touched files.
• Module docstrings are added to new Python scripts.
• New rules are documented in the appropriate doc/*.md files.
• Major features are documented in doc/index.md.

[daniel-rdt]

Thanks @tgilon. This is clean and definitely makes sense to me to only save the relevant information based on the unique project_id in the method table output.

Some small suggestions and you accidentally linked the issue instead of the PR in the release note. Otherwise, this is good for me and I will already approve 👍

[tgilon]

Ready to be merged after #802