Replace hardcoded mock job data with fixtures (1)

What does this MR do and why?

Replace hardcoded mock job data with a fixtures.

This fixtures are generated by the same queries that are used in the frontend, allowing them to stay in sync with the frontend changes.

Why?

I decided to work on this as part of the devopsverify Hackathon week so it has no issue attached, it's just something I have been meaning to do!

Screenshots or screen recordings

NA

How to set up and validate locally

NA

MR acceptance checklist

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