fix: Earned Leave allocation from Leave Policy Assignment

[ruchamahabal]

Problem:

Earned Leave allocation via Leave Policy Assignment is incorrect.

Steps to replicate:

1. Create a Leave Type for Earned Leave with monthly frequency
   

2. Create a Leave Policy with Earned Leave

3. Create Leave Policy Assignment based on Leave Period. The Leave Allocation created from this assignment should allocate 0 leaves first since it is an Earned Leave and the scheduler will allocate leaves based on the set frequency (eg: if the policy is for 12 earned leaves for Monthly frequency, then the employee should get 0 leaves at first and 1 leave allocated at the end of every month). However, currently, it allocates all 12 leaves on assignment submission.

   

Fix:

The get_leaves_for_passed_months does not reset leaves allocated if months passed are 0 i.e if the allocation is done in the first month of the leave period

[codecov]

Codecov Report

Merging #29163 (c5d1c30) into develop (fcc5fa1) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop   #29163      +/-   ##
===========================================
+ Coverage    55.78%   55.81%   +0.03%     
===========================================
  Files         1107     1107              
  Lines        67359    67360       +1     
===========================================
+ Hits         37575    37597      +22     
+ Misses       29784    29763      -21     

Impacted Files	Coverage Δ
...leave_policy_assignment/leave_policy_assignment.py	85.57% <100.00%> (+0.14%)	⬆️
...ctype/woocommerce_settings/woocommerce_settings.py	80.00% <0.00%> (-4.00%)	⬇️
...e/asset_value_adjustment/asset_value_adjustment.py	86.04% <0.00%> (-3.49%)	⬇️
erpnext/education/doctype/student/student.py	73.68% <0.00%> (-3.16%)	⬇️
...ion/doctype/course_enrollment/course_enrollment.py	44.00% <0.00%> (-2.00%)	⬇️
erpnext/stock/reorder_item.py	75.21% <0.00%> (-1.71%)	⬇️
.../hr/doctype/upload_attendance/upload_attendance.py	44.69% <0.00%> (-1.52%)	⬇️
erpnext/portal/utils.py	28.98% <0.00%> (-1.45%)	⬇️
.../report/stock_projected_qty/stock_projected_qty.py	88.15% <0.00%> (-1.32%)	⬇️
erpnext/accounts/deferred_revenue.py	75.87% <0.00%> (-0.88%)	⬇️
... and 16 more

[ruchamahabal]

@Mergifyio backport version-13-hotfix version-13-pre-release

[mergify]

backport version-13-hotfix version-13-pre-release

✅ Backports have been created

• #29165 fix: Earned Leave allocation from Leave Policy Assignment (backport #29163) has been created for branch version-13-hotfix
• #29166 fix: Earned Leave allocation from Leave Policy Assignment (backport #29163) has been created for branch version-13-pre-release