chore: removal of decapitalization feature (backport #45162)

[mergify]

Removed Decapitalization feature from asset capitalization.
UI changes for Asset Capitalization DocType.

---

This is an automatic backport of pull request #45162 done by Mergify.

[mergify]

Cherry-pick of 7ea73d8 has failed:

On branch mergify/bp/version-15-hotfix/pr-45162
Your branch is up to date with 'origin/version-15-hotfix'.

You are currently cherry-picking commit 7ea73d8265.
  (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/assets/doctype/asset/asset.json
	modified:   erpnext/assets/doctype/asset/asset.py
	modified:   erpnext/assets/doctype/asset/asset_list.js
	modified:   erpnext/assets/doctype/asset/depreciation.py
	modified:   erpnext/assets/doctype/asset_capitalization/asset_capitalization.js
	modified:   erpnext/assets/doctype/asset_capitalization/asset_capitalization.py
	modified:   erpnext/assets/doctype/asset_capitalization/test_asset_capitalization.py
	modified:   erpnext/assets/report/fixed_asset_register/fixed_asset_register.py

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

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