fix: get batch_no. for item automatically

[Shram007]

Issue:

• When selecting an item for POS, batch no. for the item wasn't selected automatically. one would have to select it manually like shown below:

Fix:

• adding batch no. to result. It now works in the following way:

[codecov]

Codecov Report

Merging #34473 (eb9c495) into develop (2942cee) will decrease coverage by 0.24%.
The diff coverage is 84.03%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #34473      +/-   ##
===========================================
- Coverage    64.09%   63.85%   -0.24%     
===========================================
  Files          810      810              
  Lines        59372    59493     +121     
===========================================
- Hits         38052    37987      -65     
- Misses       21320    21506     +186     

Impacted Files	Coverage Δ
...ement_of_accounts/process_statement_of_accounts.py	0.00% <0.00%> (ø)
...ext/accounts/report/trial_balance/trial_balance.py	0.00% <0.00%> (ø)
erpnext/hooks.py	100.00% <ø> (ø)
...facturing/doctype/bom_update_log/bom_update_log.py	42.60% <0.00%> (-44.12%)	⬇️
...rpnext/selling/page/point_of_sale/point_of_sale.py	43.90% <0.00%> (ø)
...stock/doctype/item_alternative/item_alternative.py	0.00% <0.00%> (ø)
erpnext/www/book_appointment/index.py	0.00% <0.00%> (ø)
erpnext/controllers/website_list_for_contact.py	53.54% <42.85%> (+0.05%)	⬆️
erpnext/utilities/doctype/video/video.py	23.07% <50.00%> (+0.85%)	⬆️
erpnext/controllers/sales_and_purchase_return.py	90.52% <55.55%> (-1.26%)	⬇️
... and 16 more

... and 10 files with indirect coverage changes