refactor: update_serial_no function for old Maintenance Visits (backport #28843)

[mergify]

This is an automatic backport of pull request #28843 done by Mergify.
Cherry-pick of 4f52b86 has failed:

On branch mergify/bp/version-13-hotfix/pr-28843
Your branch is up to date with 'origin/version-13-hotfix'.

You are currently cherry-picking commit 4f52b86d7e.
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Changes to be committed:
	modified:   erpnext/maintenance/doctype/maintenance_schedule/maintenance_schedule.py

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   erpnext/maintenance/doctype/maintenance_visit/maintenance_visit.js

Cherry-pick of c872aa4 has failed:

On branch mergify/bp/version-13-hotfix/pr-28843
Your branch is ahead of 'origin/version-13-hotfix' by 1 commit.
  (use "git push" to publish your local commits)

You are currently cherry-picking commit c872aa43f8.
  (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:
	new file:   erpnext/patches/v13_0/update_maintenance_schedule_field_in_visit.py

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   erpnext/patches.txt

Cherry-pick of b98c61f has failed:

On branch mergify/bp/version-13-hotfix/pr-28843
Your branch is ahead of 'origin/version-13-hotfix' by 4 commits.
  (use "git push" to publish your local commits)

You are currently cherry-picking commit b98c61f2a7.
  (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:   erpnext/maintenance/doctype/maintenance_visit/maintenance_visit.json
	modified:   erpnext/maintenance/doctype/maintenance_visit/maintenance_visit.py

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   erpnext/maintenance/doctype/maintenance_visit/maintenance_visit.js

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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[marination]

Unrelated test_rejected_serial_no and test_payment_days_in_salary_slip_based_on_timesheet failing
edit: test_rejected_serial_no breaks outside this branch too checked locally, will fix separately

[marination]

@Mergifyio backport version-13-pre-release

[mergify]

backport version-13-pre-release

✅ Backports have been created

• #29357 refactor: update_serial_no function for old Maintenance Visits (backport #28843) (backport #29352) has been created for branch version-13-pre-release