Move fixtures to another file

What does this MR do?

Resolves #217404 (closed) : relocates the fixtures to a proper place.

Does this MR meet the acceptance criteria?

Conformity

• [-] Changelog entry
• [-] Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• [-] Database guides
• Separation of EE specific content

Availability and Testing

N/A, this only changes specs itself.

Security

N/A

Relates to #217404 (closed)