refactor: refactor input definitions to use conditional input files

[tgilon]

Closes # (if applicable).

Changes proposed in this Pull Request

This PR suggests making the workflow more modular. It refactors the input definitions to use conditional input files. This is useful for soft-forks and helps to keep the DAG as small as possible.

Checklist

Required:

• 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.
• For new data sources or versions, these instructions have been followed.
• New rules are documented in the appropriate doc/*.md files.