infrastructure-monitoring-and-testing: Add document

Discuss challenges and approaches wrt. infrastructure maintenance.

Rendered PDF: https://gitlab.apertis.org/docs/apertis-website/-/jobs/457303/artifacts/file/public/designs/infrastructure-monitoring-and-testing/infrastructure-monitoring-and-testing.pdf

️ https://www.apertis.org/architecture/infrastructure-monitoring-and-testing/

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I think we have a few other documents that may overlap to some degree with this document (with varying degrees of bitrot):

• https://www.apertis.org/designs/jenkins-docker/
• https://www.apertis.org/designs/image-build-infrastructure/

Could these documents be updated, merged, linked to, deleted as appropriate if they are related?

(If they are still relevant, extra bonus points for moving them to the architecture section, assuming they've been implemented or concepts if they haven't.)

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