Use shared context for common flow metrics test data
What does this MR do and why?
This MR adds a shared context for extracting common data for the flow metrics shared examples.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Related to #415306 (closed)
Edited by Adam Hegyi