[8.x] PGO: optimize collected profile file size (backport #14256)

[mergify]

Motivation/summary

This PR addresses the issue #14255, by applying some quick optimization to how CPU profiles are collected for PGO. It reduces total collection time to 5% and strips unnecessary data such as tags and profile memory addresses that don't affect PGO.

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

#14255
#13884

---

This is an automatic backport of pull request #14256 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 3833927 has failed:

On branch mergify/bp/8.x/pr-14256
Your branch is up to date with 'origin/8.x'.

You are currently cherry-picking commit 3833927f8.
  (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/benchmarks.yml
	both modified:   systemtest/benchtest/profiles.go
	both modified:   testing/benchmark/Makefile

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

[mergify]

This pull request is now in conflicts. Could you fix it @mergify[bot]? 🙏
To fixup this pull request, you can check out it locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

git fetch upstream
git checkout -b mergify/bp/8.x/pr-14256 upstream/mergify/bp/8.x/pr-14256
git merge upstream/8.x
git push upstream mergify/bp/8.x/pr-14256