Pro-active option to enable gpt-5 use in Agents Playground

[LazaUK]

Added note about gpt-5 model config, as it doesn't support obsolete parameters like "temperature" and "top_p", which are still available in the Agents Playground. That's why the value of those 2 parameters should remain at default "1" to prevent "unsupported parameter" error message.

[learn-build-service-prod]

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[Copilot]

Pull Request Overview

This PR adds a proactive note about gpt-5 model configuration in the Agents Playground to prevent common user errors. Since gpt-5 models do not support the obsolete temperature and top_p parameters that are still present in the UI, users need guidance to avoid encountering "unsupported parameter" errors.

Key changes:

• Added documentation note warning users to keep temperature and top_p at default value of 1 when using gpt-5 models in Agents Playground

[v-dirichards]

@aahill

Can you review the proposed changes?

Important: When the changes are ready for publication, adding a #sign-off comment is the best way to signal that the PR is ready for the review team to merge.

#label:"aq-pr-triaged"
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#assign: @aahill

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[v-ccolin]

I sent an email to the content owner today.

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