Move quarantine tag to describe block

What does this MR do?

The nightly run is not picking up the cluster health graphs test since the :quarantine tag is wrapped around the context, whereas the :orchestrated, :kubernetes is attached to the description.

Same problem as here: !19586 (merged)

Related issue: #35429 (closed)

Does this MR meet the acceptance criteria?

Conformity

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