fix: consider cases for partially consumed carry-forwarded and new leaves with carry-forwarded expiry

[ruchamahabal]

Extending the edge cases from #335

Setup:
16 new leaves allocated + 5 carry forwarded leaves that will expire on 28-02-2023
Total 21 leaves allocated

Case 3: Leave Application across carry forwarded leave expiry

Before:

After:

Case 4: Leave Application after carry forwarded leave expiry

Leave Application created after carry forwarded leave expiry date (28-02-2023)

Before:

After:

• Consider case of more leaves consumed than allocated cf leaves within the cf leave period

[codecov-commenter]

Codecov Report

Merging #370 (cff3d5a) into develop (72c4ffb) will decrease coverage by 0.02%.
The diff coverage is 100.00%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #370      +/-   ##
===========================================
- Coverage    71.69%   71.67%   -0.02%     
===========================================
  Files          181      181              
  Lines         9334     9342       +8     
===========================================
+ Hits          6692     6696       +4     
- Misses        2642     2646       +4     

Impacted Files	Coverage Δ
.../hr/doctype/leave_application/leave_application.py	79.69% <100.00%> (+0.31%)	⬆️
hrms/hr/doctype/shift_type/shift_type.py	87.50% <0.00%> (-2.28%)	⬇️
...ms/hr/doctype/shift_assignment/shift_assignment.py	90.77% <0.00%> (-0.49%)	⬇️
hrms/payroll/doctype/salary_slip/salary_slip.py	87.88% <0.00%> (-0.11%)	⬇️