ci: Introduce a CI template for the monolith gems
What does this MR do and why?
This brings consistency to the monolith gems' CI configs.
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 #416162 (closed).
Edited by Rémy Coutable