test: don't silently fail reposts in tests

[ankush]

Because of this silent rollback and exception handling, it's difficult to debug what's actually failing.

Discovered while debugging frappe/frappe#17350 where some generated query is invalid but no proper exception is raised.

[codecov]

Codecov Report

Merging #31559 (926e1c7) into develop (0c2e069) will increase coverage by 0.09%.
The diff coverage is 82.78%.

@@             Coverage Diff             @@
##           develop   #31559      +/-   ##
===========================================
+ Coverage    64.58%   64.68%   +0.09%     
===========================================
  Files          965      972       +7     
  Lines        65152    65638     +486     
===========================================
+ Hits         42080    42458     +378     
- Misses       23072    23180     +108     

Impacted Files	Coverage Δ
...ontract_order_summary/subcontract_order_summary.py	0.00% <0.00%> (ø)
...cturing/doctype/production_plan/production_plan.py	74.95% <ø> (ø)
...ype/repost_item_valuation/repost_item_valuation.py	69.07% <0.00%> (-0.93%)	⬇️
...ounts/doctype/purchase_invoice/purchase_invoice.py	83.23% <50.00%> (-0.25%)	⬇️
erpnext/controllers/accounts_controller.py	84.98% <50.00%> (-0.68%)	⬇️
erpnext/stock/get_item_details.py	80.20% <50.00%> (-0.18%)	⬇️
...xt/buying/doctype/purchase_order/purchase_order.py	73.41% <55.10%> (-5.88%)	⬇️
erpnext/stock/stock_ledger.py	89.86% <70.00%> (-1.33%)	⬇️
erpnext/controllers/buying_controller.py	83.95% <71.42%> (-3.90%)	⬇️
erpnext/stock/doctype/stock_entry/stock_entry.py	81.14% <71.87%> (-0.94%)	⬇️
... and 42 more