[8.13] [ESS][Pt. Duex] Adding value list file size constraints to UI docs (backport #5001)

[mergify]

Contributes to https://github.com/elastic/security-docs-internal/issues/5

Preview: Create and manage value lists | Create value lists

Twin Serverless PR: https://github.com/elastic/staging-serverless-security-docs/pull/311

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This is an automatic backport of pull request #5001 done by Mergify.

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