fix: credit limit validation in delivery note

[nextchamp-saqib]

Problem:

• Create a Customer with a Credit Limit of 200 and "Bypass Credit Limit at SO" checked
• Create a Sales Order for 200 against that customer
• Create a Sales Invoice against the Sales Order
• Create a Delivery Note against the Sales Invoice or Sales Order
• On DN submission user gets an error "Credit Limit exhausted"
  • Fix: Since DN is against SO / SI, the credit limit shouldn't be validated

[codecov]

Codecov Report

Merging #30470 (c122882) into develop (760e68b) will increase coverage by 23.98%.
The diff coverage is 16.66%.

@@             Coverage Diff              @@
##           develop   #30470       +/-   ##
============================================
+ Coverage    36.80%   60.79%   +23.98%     
============================================
  Files         1081     1082        +1     
  Lines        68920    69061      +141     
============================================
+ Hits         25367    41986    +16619     
+ Misses       43553    27075    -16478     

Impacted Files	Coverage Δ
...pnext/stock/doctype/delivery_note/delivery_note.py	68.91% <0.00%> (+8.42%)	⬆️
...item_wise_sales_history/item_wise_sales_history.py	32.35% <100.00%> (+32.35%)	⬆️
.../report/delayed_item_report/delayed_item_report.py	60.78% <0.00%> (-35.30%)	⬇️
...tch_item_expiry_status/batch_item_expiry_status.py	67.92% <0.00%> (-24.53%)	⬇️
...wise_balance_history/batch_wise_balance_history.py	67.79% <0.00%> (-22.04%)	⬇️
...payroll/doctype/income_tax_slab/income_tax_slab.py	83.33% <0.00%> (-16.67%)	⬇️
...value/warehouse_wise_item_balance_age_and_value.py	89.02% <0.00%> (-2.44%)	⬇️
...saction/incorrect_balance_qty_after_transaction.py	88.37% <0.00%> (-2.33%)	⬇️
...rpnext/stock/report/stock_balance/stock_balance.py	78.10% <0.00%> (-0.60%)	⬇️
erpnext/e_commerce/product_data_engine/query.py	75.36% <0.00%> (ø)
... and 448 more