[26.1] Iceberg stress testing and performance tuning

[kbatuigas]

Description

Resolves https://redpandadata.atlassian.net/browse/
Review deadline:

Page previews

https://deploy-preview-1599--redpanda-docs-preview.netlify.app/current/manage/iceberg/iceberg-performance-tuning/

Checks

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

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