📝 Unify checks in the components’ job description lists

[Glutexo]

• The Operator checks the existence of .urls files. If it’s there, the Operator has already processed the corresponding structured data in the .json file.
• The Downloader checks the existence of .raw files. If it’s there, the Downloader already downloaded the corresponding URL.
• The Parser checks the existence of .json files. If it’s there, the Parser already parsed the corresponding downloaded content in the .raw file.

Consolidate the numbered lists so they describe the check consistently.

[Glutexo]

I added a “blocked” label because the consolidation is challenging to do when the sections are in different languages. It is possible but prone to errors.