[8.13](backport #2089) Update rerun workflow

[mergify]

Summary of your changes

This PR updates rerun workflow with env vars

Screenshot/Data

Related Issues

Checklist

• I have added tests that prove my fix is effective or that my feature works
• I have added the necessary README/documentation (if appropriate)

Introducing a new rule?

• Generate rule metadata using this script
• Add relevant unit tests
• Generate relevant rule templates using this script, and open a PR in elastic/packages/cloud_security_posture

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This is an automatic backport of pull request #2089 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 61b21ec has failed:

On branch mergify/bp/8.13/pr-2089
Your branch is up to date with 'origin/8.13'.

You are currently cherry-picking commit 61b21ecb.
  (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)

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

no changes added to commit (use "git add" and/or "git commit -a")

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