[8.7](backport #2431) Temporarily disable long running tests

[mergify]

Summary of your changes

Before this change all the PRs were executing these long running jobs, on avg ~15min each run. But the branch with the changes was not the one being tested, rather just main, therefore wasting time and resource. With the ticket https://github.com/elastic/security-team/issues/9129 we will solve this issue. But in the meanwhile, we are disabling these jobs.

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This is an automatic backport of pull request #2431 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 48283b6 has failed:

On branch mergify/bp/8.7/pr-2431
Your branch is up to date with 'origin/8.7'.

You are currently cherry-picking commit 48283b6b.
  (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/rm <file>..." as appropriate to mark resolution)
	deleted by us:   .github/workflows/ci.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