Start OOM doc draft

[kbatuigas]

Description

This pull request adds a new troubleshooting guide focused on handling memory-related query cancellations in Redpanda SQL. The page explains the automatic out-of-memory (OOM) protection mechanism, describes the client-facing error, and gives actionable steps for users to recover from or prevent repeated cancellations. It also provides guidance on monitoring memory usage and includes several TODOs for subject matter expert (SME) validation.

Key additions:

Troubleshooting documentation:

• Added a new page, memory-management.adoc, that explains how Redpanda SQL cancels queries when a node approaches its memory limit and how users can recover from or prevent these cancellations.
• Provided actionable recommendations for users experiencing repeated OOM cancellations, including reducing query concurrency, simplifying queries, or scaling up the cluster.
• Documented how to monitor node memory usage using the oxla_process_memory_total Prometheus metric.

Guidance for further validation:

• Included several SME-directed TODOs to confirm error message details, recommended runbook steps, and configuration options for memory limits.

Resolves https://github.com/redpanda-data/documentation-private/issues/
Review deadline: 20 May

Page previews

Checks

• New feature
• Content gap
• Support Follow-up
• Small fix (typos, links, copyedits, etc)

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