github-actions: support id-token for the bk flaky test reporter

[v1v]

Proposed commit message

Fix permissions and remove the checkout, it's not needed

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works. Where relevant, I have used the stresstest.sh script to run them under stress conditions and race detector to verify their stability.
• I have added an entry in ./changelog/fragments using the changelog tool.

Disruptive User Impact

Author's Checklist

• [ ]

How to test this PR locally

NA

Only in the CI, see https://github.com/elastic/beats/actions/runs/23837259262/job/69483908576 that produced:

• [Flaky Test] github.com/elastic/beats/v7/x-pack/metricbeat/tests/integration TestMetricbeatOTelE2E #49827

Related issues

Use cases

Screenshots

Logs

[botelastic]

This pull request doesn't have a Team:<team> label.

[github-actions]

🤖 GitHub comments

Just comment with:

• run docs-build : Re-trigger the docs validation. (use unformatted text in the comment!)

[mergify]

This pull request does not have a backport label.
If this is a bug or security fix, could you label this PR @v1v? 🙏.
For such, you'll need to label your PR with:

• The upcoming major version of the Elastic Stack
• The upcoming minor version of the Elastic Stack (if you're not pushing a breaking change)

To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-8./d is the label to automatically backport to the 8./d branch. /d is the digit
• backport-active-all is the label that automatically backports to all active branches.
• backport-active-8 is the label that automatically backports to all active minor branches for the 8 major.
• backport-active-9 is the label that automatically backports to all active minor branches for the 9 major.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: f009ef36-3b34-4a1e-92bf-53bb4d44c65d

📥 Commits

Reviewing files that changed from the base of the PR and between ca355b1 and 257ec8b.

📒 Files selected for processing (1)

• .github/workflows/buildkite-test-flaky.yml

---

📝 Walkthrough

Walkthrough

The buildkite-test-flaky workflow job configuration was updated with two changes: the job-level permissions now include id-token: write to support token-based operations, and the actions/checkout@v6 step was removed from the job steps. The remaining steps that handle token creation and flaky test reporting continue unchanged. No additional checkout step was added as a replacement.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch v1v-patch-1

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

---

_{Comment @coderabbitai help to get the list of available commands and usage tips.}