feat: add key_usage parameter to certificate variable type

[wpt1313]

No description provided.

[coderabbitai]

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: e8d733b3-0073-48c9-b81c-149f6b7a2761

📥 Commits

Reviewing files that changed from the base of the PR and between f8362ff and 554d7c3.

📒 Files selected for processing (1)

• content/variable-types.md

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Walkthrough

Adds documentation for the optional key_usage generation option on the certificate variable type, including supported values, an empty-list default, and an example.

Suggested reviewers: neddp

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Description check	❓ Inconclusive	No pull request description was provided, so there is no content to evaluate.	Add a brief description of the change and its intent so reviewers can confirm it matches the PR.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly describes the main change: adding key_usage to the certificate variable type.
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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[a-hassanin]

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