chore: quickbooks migrator integration removal (backport #45240)

[mergify]

Removal of QuickBooks Migrator Feature from ERPNext Integration.

---

This is an automatic backport of pull request #45240 done by Mergify.

[mergify]

Cherry-pick of d13c036 has failed:

On branch mergify/bp/version-15-hotfix/pr-45240
Your branch is up to date with 'origin/version-15-hotfix'.

You are currently cherry-picking commit d13c03676b.
  (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:
	deleted:    erpnext/erpnext_integrations/doctype/quickbooks_migrator/__init__.py
	deleted:    erpnext/erpnext_integrations/doctype/quickbooks_migrator/quickbooks_migrator.js
	deleted:    erpnext/erpnext_integrations/doctype/quickbooks_migrator/quickbooks_migrator.py

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by them: erpnext/erpnext_integrations/doctype/quickbooks_migrator/quickbooks_migrator.json
	deleted by them: erpnext/erpnext_integrations/doctype/quickbooks_migrator/test_quickbooks_migrator.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