Update technical preview description

[lcawl]

This PR is a follow-up to #3398.
It updates the description that appears in the applies-to popover for "technical preview".

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Enterprise

Run ID: a7244a51-b26a-47c4-b326-e7bd0c9acab5

📥 Commits

Reviewing files that changed from the base of the PR and between 947c578 and 7c9d82f.

📒 Files selected for processing (4)

• src/Elastic.Markdown/Myst/Components/LifecycleDescriptions.cs
• tests/authoring/Applicability/ApplicableToComponent.fs
• tests/authoring/Blocks/Admonitions.fs
• tests/authoring/Inline/AppliesToRole.fs

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📝 Walkthrough

Walkthrough

This PR updates the wording for the technical preview lifecycle description in the Elastic Markdown documentation system. The change modifies the TechnicalPreview description when isReleased is true, replacing messaging that emphasized the feature was "not ready for production" with new text indicating it is "ready for evaluation" with appropriate caution guidance. The source change is a single update in LifecycleDescriptions.cs, followed by corresponding updates to test assertions across three test files to validate the new output format.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'Update technical preview description' accurately summarizes the main change—updating the lifecycle description text for technical preview in the popover.
Description check	✅ Passed	The description clearly relates to the changeset by identifying it as a follow-up updating the technical preview description in the applies-to popover.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

✨ Simplify code

• Create PR with simplified code
• Commit simplified code in branch tech-preview

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