fix(patch): delete hospitality custom fields

[ankush]

Missed out the deletion of custom fields as pointed out here: #29167 (comment)

to test:

• just see if the sales invoice page opens or not.
• check if restaurant custom field got deleted from custom fields list.

[ankush]

IMO this should just be part of delete_doc(doctype) for a simple reason: not deleting linked custom fields makes the whole form unusable (it just logs you out totally without any hints! LMAO)

https://github.com/frappe/frappe/blob/1e70c02e43b3a7212e4c35598721dcf1d183c249/frappe/model/delete_doc.py#L68

There could be one more delete here

frappe.db.delete("Custom Field", {"options": name})

@gavindsouza

[codecov]

Codecov Report

Merging #29382 (5d1286e) into develop (c8489d6) will decrease coverage by 0.08%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop   #29382      +/-   ##
===========================================
- Coverage    57.88%   57.80%   -0.09%     
===========================================
  Files         1091     1091              
  Lines        67850    67866      +16     
===========================================
- Hits         39278    39232      -46     
- Misses       28572    28634      +62     

Impacted Files	Coverage Δ
...unts/report/purchase_register/purchase_register.py	32.19% <0.00%> (-45.90%)	⬇️
erpnext/utilities/product.py	14.70% <0.00%> (-35.30%)	⬇️
...ext/accounts/report/balance_sheet/balance_sheet.py	36.36% <0.00%> (-21.82%)	⬇️
erpnext/shopping_cart/product_info.py	30.30% <0.00%> (-21.22%)	⬇️
...e_purchase_register/item_wise_purchase_register.py	58.00% <0.00%> (-20.00%)	⬇️
.../report/bom_operations_time/bom_operations_time.py	89.13% <0.00%> (-7.54%)	⬇️
...it_and_loss_statement/profit_and_loss_statement.py	71.42% <0.00%> (-3.90%)	⬇️
erpnext/assets/doctype/asset/depreciation.py	85.23% <0.00%> (-2.69%)	⬇️
...e/shopping_cart_settings/shopping_cart_settings.py	66.03% <0.00%> (-1.89%)	⬇️
erpnext/shopping_cart/product_query.py	61.19% <0.00%> (-1.50%)	⬇️
... and 34 more