perf: use base32 space for random names instead of base16 (backport #25497)

[mergify]

Better implementation of #25309

This has all the same benefits as before:

operation	before	after	difference
read a single document w/ 1000 child table rows; MySQL pages read	885	8	100x reduction

With the added benefits:

• names are sequential for at 32^4 /10 seconds (as opposed to completely random distribution)
• Collision is far less likely now (base32 vs base16)

---

This is an automatic backport of pull request #25497 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of adf24b2 has failed:

On branch mergify/bp/version-15-hotfix/pr-25497
Your branch is up to date with 'origin/version-15-hotfix'.

You are currently cherry-picking commit adf24b24d4.
  (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:   frappe/tests/test_naming.py

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   frappe/model/naming.py

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

[frappe-pr-bot]

🎉 This PR is included in version 15.25.0 🎉

The release is available on GitHub release

Your semantic-release bot 📦🚀