fix: map missing fields in opportunity

[pateljannat]

Issue:

1. When we create an Opportunity from Lead manually, the Opportunity picks the value of similar fields from Lead doctype.
2. The same does not happen when Opportunity is created from Lead using data import.

Fix:

1. Added logic on the server-side, which checks if a field in opportunity does not have a value and this field is present in Lead/Customer doctype then fetch that value and add it to the field in Opportunity.

[codecov]

Codecov Report

Merging #27904 (1988f20) into develop (2b9b158) will decrease coverage by 0.09%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop   #27904      +/-   ##
===========================================
- Coverage    54.44%   54.35%   -0.10%     
===========================================
  Files         1254     1254              
  Lines        67750    67759       +9     
===========================================
- Hits         36885    36828      -57     
- Misses       30865    30931      +66     

Impacted Files	Coverage Δ
erpnext/crm/doctype/opportunity/opportunity.py	72.27% <100.00%> (+1.29%)	⬆️
...eport/item_variant_details/item_variant_details.py	32.14% <0.00%> (-52.39%)	⬇️
...tch_item_expiry_status/batch_item_expiry_status.py	69.81% <0.00%> (-24.53%)	⬇️
...wise_balance_history/batch_wise_balance_history.py	69.49% <0.00%> (-22.04%)	⬇️
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%)	⬇️
...eorder_level/itemwise_recommended_reorder_level.py	92.45% <0.00%> (-1.89%)	⬇️
erpnext/portal/utils.py	30.00% <0.00%> (-1.43%)	⬇️
erpnext/accounts/deferred_revenue.py	75.22% <0.00%> (-0.89%)	⬇️
erpnext/stock/reorder_item.py	76.27% <0.00%> (-0.85%)	⬇️
... and 15 more

[pateljannat]

@Mergifyio backport version-13-hotfix

[pateljannat]

@Mergifyio backport version-13-pre-release

[mergify]

backport version-13-hotfix

✅ Backports have been created

• #28012 fix: map missing fields in opportunity (backport #27904) has been created for branch version-13-hotfix

[mergify]

backport version-13-pre-release

✅ Backports have been created

• #28013 fix: map missing fields in opportunity (backport #27904) has been created for branch version-13-pre-release