chore: Enable plan stability tests for native_iceberg_compat

[andygrove]

Which issue does this PR close?

Closes #2469

Rationale for this change

What changes are included in this PR?

• Code changes are in the first commit
• The other commits are for updating golden files

How are these changes tested?

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 58.98%. Comparing base (f09f8af) to head (a133065).
⚠️ Report is 569 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2519      +/-   ##
============================================
+ Coverage     56.12%   58.98%   +2.85%     
- Complexity      976     1457     +481     
============================================
  Files           119      146      +27     
  Lines         11743    13550    +1807     
  Branches       2251     2356     +105     
============================================
+ Hits           6591     7992    +1401     
- Misses         4012     4337     +325     
- Partials       1140     1221      +81     

☔ 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.

[parthchandra]

lgtm