add jdk 26 test

[SylvainJuge]

• rename jdk test to jdk-test to easily identify JDK tests and make it easier to add them as branch protection rules required checks.
• addk JDK 26 to the test matrix

[github-actions]

📋 Changelog

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Enterprise

Run ID: b5d00bbd-e7d4-4562-96ce-2877e29a6036

📥 Commits

Reviewing files that changed from the base of the PR and between e9d8300 and d6b45fe.

📒 Files selected for processing (1)

• .github/workflows/build.yml

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📝 Walkthrough

Walkthrough

The GitHub Actions build workflow was updated to rename the test job to jdk-matrix and extend its test matrix with JDK 26 entries for both hotspot and openj9 virtual machines. A new follow-up job jdk-test was introduced that runs unconditionally after jdk-matrix and enforces workflow failure if the preceding job did not succeed.

🚥 Pre-merge checks | ✅ 2

✅ Passed checks (2 passed)

Check name	Status	Explanation
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

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch test-jdk-26

• 🛠️ Update Documentation: Commit on current branch
• 🛠️ Update Documentation: Create PR

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