Add opensearch cluster to the reference architecture
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What does this MR do and why?
The current reference architecture documentation does not mention the possibility of integrating an OpenSearch cluster. This omission may lead to confusion or missed opportunities for users who wish to enable advanced search capabilities available in GitLab Enterprise Edition (EE) or Ultimate. Including OpenSearch in the architecture—clearly marked as optional—would help clarify its role and relevance, especially for teams evaluating or planning deployments that require enhanced search features.
see #555958 (closed)
References
The goal is to add the OpenSearch cluster to this documentation : https://docs.gitlab.com/administration/reference_architectures/
Screenshots or screen recordings
Example of update for 5k architecture only, but all architectures have been updated
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How to set up and validate locally
Documentation rendering and comparison :
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Related to #555958 (closed)