fix: supplied items added twice in Stock Entry

[s-aga-r]

ref: ISS-22-23-02579

Problem: Supplied Items added twice while creating Stock Entry of type Send to Subcontractor with Purchase Order reference i.e., Old Subcontracting Flow

#32274

[codecov]

Codecov Report

Merging #32406 (a145d10) into develop (dde8b2a) will decrease coverage by 0.12%.
The diff coverage is 100.00%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #32406      +/-   ##
===========================================
- Coverage    63.88%   63.76%   -0.13%     
===========================================
  Files          817      817              
  Lines        58179    58179              
===========================================
- Hits         37170    37099      -71     
- Misses       21009    21080      +71     

Impacted Files	Coverage Δ
erpnext/controllers/subcontracting_controller.py	86.34% <100.00%> (ø)
...eport/item_variant_details/item_variant_details.py	31.32% <0.00%> (-53.02%)	⬇️
...ext/accounts/report/balance_sheet/balance_sheet.py	36.36% <0.00%> (-21.82%)	⬇️
erpnext/accounts/doctype/bank/bank.py	71.42% <0.00%> (-14.29%)	⬇️
...saction/incorrect_balance_qty_after_transaction.py	88.37% <0.00%> (-11.63%)	⬇️
...rpnext/accounts/doctype/shareholder/shareholder.py	80.00% <0.00%> (-10.00%)	⬇️
...urity_shortfall/process_loan_security_shortfall.py	93.75% <0.00%> (-6.25%)	⬇️
...rpnext/stock/report/stock_balance/stock_balance.py	84.65% <0.00%> (-3.73%)	⬇️
...e/asset_value_adjustment/asset_value_adjustment.py	87.95% <0.00%> (-3.62%)	⬇️
...ck/report/cogs_by_item_group/cogs_by_item_group.py	86.32% <0.00%> (-3.42%)	⬇️
... and 21 more