refactor: Clean up mutable defaults and add CI check

[ChillarAnand]

No description provided.

[codecov]

Codecov Report

Merging #27828 (5b4735c) into develop (d4b2471) will increase coverage by 54.53%.
The diff coverage is 60.00%.

❗ Current head 5b4735c differs from pull request most recent head 5e5e640. Consider uploading reports for the commit 5e5e640 to get more accurate results

@@             Coverage Diff              @@
##           develop   #27828       +/-   ##
============================================
+ Coverage         0   54.53%   +54.53%     
============================================
  Files            0     1248     +1248     
  Lines            0    67544    +67544     
============================================
+ Hits             0    36834    +36834     
- Misses           0    30710    +30710     

Impacted Files	Coverage Δ
erpnext/accounts/report/cash_flow/cash_flow.py	0.00% <0.00%> (ø)
erpnext/stock/doctype/serial_no/serial_no.py	78.92% <33.33%> (ø)
...stock/doctype/material_request/material_request.py	70.32% <50.00%> (ø)
...xt/hr/doctype/shift_assignment/shift_assignment.py	49.07% <55.55%> (ø)
erpnext/hr/doctype/staffing_plan/staffing_plan.py	91.13% <60.00%> (ø)
erpnext/accounts/doctype/pricing_rule/utils.py	70.16% <66.66%> (ø)
erpnext/education/doctype/student/student.py	73.95% <66.66%> (ø)
...s/doctype/promotional_scheme/promotional_scheme.py	96.93% <75.00%> (ø)
erpnext/hr/doctype/holiday_list/holiday_list.py	80.95% <100.00%> (ø)
erpnext/stock/get_item_details.py	79.53% <100.00%> (ø)
... and 1248 more