fix: create auto_repeat field only if docfield/custom field does not exist (bp #11827)

[mergify]

This is an automated backport of pull request #11827 done by Mergify

Cherry-pick of 044da8a has failed:

On branch mergify/bp/version-13-beta/pr-11827
Your branch is up to date with 'origin/version-13-beta'.

You are currently cherry-picking commit 044da8a575.
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Changes to be committed:

	modified:   frappe/core/doctype/doctype/doctype.py

Unmerged paths:
  (use "git add <file>..." to mark resolution)

	both modified:   frappe/custom/doctype/customize_form/customize_form.py

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[scmmishra]

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