fix(ux): ensure correct-ish transfer against in BOM

[ankush]

In BOM there are three options for transfer material against:

• empty (to allow setting and using defaults while saving a new doc)
• job card
• work order

This PR adds some constraint/sane defaults:

1. When there are no operations force Work Order.
2. Don't allow empty transfer against.

---

Similarly for work order:

1. If no operations are present then set "Work Order" as default material transfer against option while submitting.
2. Don't allow empty transfer against.

---

Patch existing BOMs but not Work Order. (patching finished WO is not useful and ongoing WO anyways shouldn't be patched)

[codecov]

Codecov Report

Merging #29487 (125b571) into develop (b05287d) will increase coverage by 0.03%.
The diff coverage is 92.85%.

@@             Coverage Diff             @@
##           develop   #29487      +/-   ##
===========================================
+ Coverage    58.48%   58.52%   +0.03%     
===========================================
  Files         1091     1091              
  Lines        67885    67899      +14     
===========================================
+ Hits         39704    39737      +33     
+ Misses       28181    28162      -19     

Impacted Files	Coverage Δ
...ext/manufacturing/doctype/work_order/work_order.py	74.77% <87.50%> (+0.15%)	⬆️
erpnext/manufacturing/doctype/bom/bom.py	86.98% <100.00%> (+0.12%)	⬆️
.../report/delayed_item_report/delayed_item_report.py	60.78% <0.00%> (-35.30%)	⬇️
...t/accounts/report/sales_register/sales_register.py	71.51% <0.00%> (-9.10%)	⬇️
...t/payroll/doctype/payroll_period/payroll_period.py	64.81% <0.00%> (-5.56%)	⬇️
...pnext/accounts/report/gross_profit/gross_profit.py	82.49% <0.00%> (-3.51%)	⬇️
...t/product_bundle_balance/product_bundle_balance.py	79.54% <0.00%> (-2.28%)	⬇️
...eorder_level/itemwise_recommended_reorder_level.py	92.45% <0.00%> (-1.89%)	⬇️
...em_wise_sales_register/item_wise_sales_register.py	61.36% <0.00%> (-1.82%)	⬇️
erpnext/portal/utils.py	28.98% <0.00%> (-1.45%)	⬇️
... and 27 more