[8.15] ci(benchmarks): read secrets for running the tear-down immediately after (backport #14323)

[mergify]

Motivation/summary

Trying to solve 'partially' the below error:

api error: root.unauthenticated: The supplied authentication is invalid

The benchmarks ran, but the API token was rotated during the execution. This can help with refreshing it since benchmarks can take 4 hours or so... so we don't know if the secret is rotated meanwhile.

Checklist

• Update CHANGELOG.asciidoc
• Documentation has been updated

For functional changes, consider:

• Is it observable through the addition of either logging or metrics?
• Is its use being published in telemetry to enable product improvement?
• Have system tests been added to avoid regression?

How to test these changes

Related issues

---

This is an automatic backport of pull request #14323 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of f5dcbf8 has failed:

On branch mergify/bp/8.15/pr-14323
Your branch is up to date with 'origin/8.15'.

You are currently cherry-picking commit f5dcbf870.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   .github/workflows/smoke-tests-ess.yml

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   .github/workflows/benchmarks.yml

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally