perf: Add indexes in stock queries and speed up bin updation

[deepeshgarg007]

• Force item and warehouse indexing for stock queries
• Convert update_stock from method to a function to reduce the get_doc call for bin

[codecov]

Codecov Report

Merging #27758 (3563d8e) into develop (6019f60) will decrease coverage by 0.07%.
The diff coverage is 94.59%.

@@             Coverage Diff             @@
##           develop   #27758      +/-   ##
===========================================
- Coverage    54.55%   54.48%   -0.08%     
===========================================
  Files         1248     1254       +6     
  Lines        67518    67727     +209     
===========================================
+ Hits         36836    36899      +63     
- Misses       30682    30828     +146     

Impacted Files	Coverage Δ
erpnext/controllers/stock_controller.py	90.69% <ø> (ø)
...k/doctype/stock_ledger_entry/stock_ledger_entry.py	85.21% <0.00%> (-0.75%)	⬇️
erpnext/stock/doctype/bin/bin.py	92.45% <95.65%> (+0.45%)	⬆️
erpnext/stock/stock_ledger.py	86.98% <100.00%> (+1.39%)	⬆️
erpnext/stock/utils.py	64.28% <100.00%> (+1.24%)	⬆️
erpnext/education/doctype/student/student.py	73.95% <0.00%> (-3.13%)	⬇️
...ion/doctype/course_enrollment/course_enrollment.py	45.09% <0.00%> (-1.97%)	⬇️
erpnext/portal/utils.py	30.00% <0.00%> (-1.43%)	⬇️
erpnext/hooks.py	0.00% <0.00%> (ø)
erpnext/regional/saudi_arabia/setup.py	0.00% <0.00%> (ø)
... and 23 more

[deepeshgarg007]

@Mergifyio backport version-13-hotfix

[mergify]

Command backport version-13-hotfix: pending

backport version-13-hotfix is pending

[mergify]

Command backport version-13-hotfix: success

Backports have been created

• #27925 perf: Add indexes in stock queries and speed up bin updation (backport #27758) has been created for branch version-13-hotfix