Refactor: Rename purchase receipt amount field to purchase amount (backport #41089)

[mergify]

Field "Purchase Receipt Amount" was getting the amount from purchase receipt amount or purchase invoice amount of the asset and it was misleading. So naming it "Purchase Amount" is better approach for better understanding.

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This is an automatic backport of pull request #41089 done by Mergify.

[mergify]

Cherry-pick of 31841b4 has failed:

On branch mergify/bp/version-15-hotfix/pr-41089
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Changes to be committed:
	modified:   erpnext/accounts/doctype/purchase_invoice/purchase_invoice.py
	modified:   erpnext/assets/doctype/asset/asset.js
	modified:   erpnext/assets/doctype/asset/test_asset.py
	modified:   erpnext/assets/doctype/asset_capitalization/asset_capitalization.py
	modified:   erpnext/assets/doctype/asset_capitalization/test_asset_capitalization.py
	modified:   erpnext/controllers/buying_controller.py
	new file:   erpnext/patches/v15_0/rename_purchase_receipt_amount_to_purchase_amount.py
	modified:   erpnext/stock/doctype/purchase_receipt/purchase_receipt.py

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

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

[frappe-pr-bot]

🎉 This PR is included in version 15.23.2 🎉

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