[fix] downgrade non-idempotent error

[muir]

Postgres changes:

Previously when you were running non-transactionally, SQL that was non-idempotent without an easy fix would result in a fatal error.
It now logs a warning.

Running DML non-transactionally is now fatal.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.30%. Comparing base (32feb25) to head (ff28cea).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #320      +/-   ##
==========================================
+ Coverage   84.17%   84.30%   +0.12%     
==========================================
  Files          16       16              
  Lines        1542     1548       +6     
==========================================
+ Hits         1298     1305       +7     
+ Misses        141      140       -1     
  Partials      103      103              

Flag	Coverage Δ
go_tests	21.25% <0.00%> (-0.09%)	⬇️
mysql_tests	48.89% <0.00%> (-0.20%)	⬇️
pg_tests	54.88% <100.00%> (+1.48%)	⬆️
singlestore_tests	45.30% <0.00%> (-0.18%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.