fix: Discount and taxes in return document should follow the reference document (backport #41911)

[mergify]

If a credit note is created against a sales invoice, the credit note should follow the same discount (based on the pricing rule) and tax template as in the original sales invoice.

Previously, if we changed the discount on the pricing rule after creating the original sales invoice, the system overwrites the discount on the credit note based on the updated pricing rule.

Similarly, the item tax template and tax table is overwritten based on the updated item tax template in the Item master.

---

This is an automatic backport of pull request #41911 done by Mergify.

[mergify]

Cherry-pick of 2811984 has failed:

On branch mergify/bp/version-14-hotfix/pr-41911
Your branch is up to date with 'origin/version-14-hotfix'.

You are currently cherry-picking commit 281198456d.
  (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/pricing_rule/test_pricing_rule.py
	modified:   erpnext/controllers/accounts_controller.py
	modified:   erpnext/controllers/taxes_and_totals.py
	modified:   erpnext/public/js/controllers/transaction.js

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

[stale]

This pull request has been automatically marked as inactive because it has not had recent activity. It will be closed within 3 days if no further activity occurs, but it only takes a comment to keep a contribution alive :) Also, even if it is closed, you can always reopen the PR when you're ready. Thank you for contributing.

[frappe-pr-bot]

🎉 This PR is included in version 14.73.1 🎉

The release is available on GitHub release

Your semantic-release bot 📦🚀