feat(app): remove concept of prioritized txs

[arajasek]

Describe your changes and provide context

This PR drops the concept of "prioritized" transactions, which are txs that are peeled out of the block to be executed first. All transactions are now executed in order.

The only prioritized transactions today are oracle txs. This is one step towards the deprecation of the oracle.

Testing performed to validate your change

[github-actions]

The latest Buf updates on your PR. Results from workflow Buf / buf (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Feb 23, 2026, 2:10 PM

[github-actions]

The latest Buf updates on your PR. Results from workflow Buf / buf (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Feb 23, 2026, 2:07 PM

[codecov]

Codecov Report

❌ Patch coverage is 45.00000% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 52.00%. Comparing base (80b9aae) to head (5d6504c).

Files with missing lines	Patch %	Lines
app/app.go	45.00%	11 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2959       +/-   ##
===========================================
- Coverage   57.83%   52.00%    -5.84%     
===========================================
  Files        2110       20     -2090     
  Lines      174123     3690   -170433     
===========================================
- Hits       100710     1919    -98791     
+ Misses      64451     1597    -62854     
+ Partials     8962      174     -8788     

Flag	Coverage Δ
sei-chain	49.67% <45.00%> (-8.14%)	⬇️
sei-db	68.49% <ø> (ø)

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

Files with missing lines	Coverage Δ
app/app.go	56.61% <45.00%> (-15.77%)	⬇️

... and 2093 files with indirect coverage changes

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