fix: stock reservation not working for sales invoice with update stock (backport #45763)

[mergify]

• Enable Stock Reservation for sales order
• Create the sales order
• System will auto reserve the stock
• Create the sales invoice against above sales order with update stock
• While submitting sales invoice, system will throw error that the stock has not reserved for the respective item

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This is an automatic backport of pull request #45763 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 0c9d0ea has failed:

On branch mergify/bp/version-15-hotfix/pr-45763
Your branch is up to date with 'origin/version-15-hotfix'.

You are currently cherry-picking commit 0c9d0ea1f4.
  (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/accounts/doctype/sales_invoice/sales_invoice.py
	modified:   erpnext/controllers/selling_controller.py
	modified:   erpnext/stock/doctype/delivery_note/delivery_note.py

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   erpnext/selling/doctype/sales_order/test_sales_order.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