fix: Validation in POS for item batch no stock quantity

[nemesis189]

Issue:

• When adding batch items to cart in POS, the stock quantity doesn't get updated and batch items are allowed to be added and submitted as well.
• Validation is thrown during consolidation when it is already too late

Issue walkthrough(Steps):

• Created Item with `Has Batch No` option checked
• Created batches for the item through material receipt - total qty 2
• The total batch qty for the batch no batch 02 is 2
• Created a pos transaction with that item and batch no and qty as 1
• Created another transaction with the item and qty as 2
• Tried consolidating(closing entry) both invoices and error is thrown because qty is not available

Solution:

• Added a validation at the time of checkout of the POS invoice itself to check for batch qty availability
• Checking qty with unconsolidated pos invoices, available qty and current pos invoice
• if available_qty - pos_reserved_qty - current_needed_qty < 0 then throw error
• 

[codecov]

Codecov Report

Merging #28907 (7385497) into develop (f02e6b4) will increase coverage by 0.05%.
The diff coverage is 88.00%.

@@             Coverage Diff             @@
##           develop   #28907      +/-   ##
===========================================
+ Coverage    55.72%   55.77%   +0.05%     
===========================================
  Files         1131     1131              
  Lines        67550    67574      +24     
===========================================
+ Hits         37639    37690      +51     
+ Misses       29911    29884      -27     

Impacted Files	Coverage Δ
...rpnext/accounts/doctype/pos_invoice/pos_invoice.py	71.58% <86.66%> (+1.10%)	⬆️
erpnext/stock/doctype/batch/batch.py	82.00% <90.00%> (+0.57%)	⬆️
...work_order_stock_report/work_order_stock_report.py	50.00% <0.00%> (-50.00%)	⬇️
.../manufacturing/report/bom_explorer/bom_explorer.py	94.44% <0.00%> (-5.56%)	⬇️
...ctype/accounting_dimension/accounting_dimension.py	64.06% <0.00%> (-1.57%)	⬇️
...e/period_closing_voucher/period_closing_voucher.py	88.23% <0.00%> (-1.48%)	⬇️
erpnext/portal/utils.py	28.98% <0.00%> (-1.45%)	⬇️
.../report/stock_projected_qty/stock_projected_qty.py	88.15% <0.00%> (-1.32%)	⬇️
...eport/production_analytics/production_analytics.py	69.51% <0.00%> (-1.22%)	⬇️
erpnext/accounts/deferred_revenue.py	75.87% <0.00%> (-0.88%)	⬇️
... and 27 more

[nextchamp-saqib]

@Mergifyio backport version-13-hotfix

[mergify]

backport version-13-hotfix

✅ Backports have been created

• #29112 fix: Validation in POS for item batch no stock quantity (backport #28907) has been created for branch version-13-hotfix