refac: remove cba.methods config option

[measrainsey]

Closes:

• [SUB] Remove cba.methods config setting #585

Changes proposed in this Pull Request

PR to remove the cba.methods config option

Tasks

• Remove cba.methods config option from config files and config validation files
• Run pixi run generate-config to make sure all config schemas are up-to-date

Workflow

The cba.methods config option was originally created when we were implementing one CBA method (TOOT/PINT) at a time into Open-TYNDP. At the time, the cba.methods was used to apply just TOOT and/or just PINT to all projects. However, since then, we've implemented both methodologies into the workflow and have assigned each project-planning horizon a method based on the input data. Thus, cba.methods is no longer needed or used.

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.

[tgilon]

Thank you @measrainsey!