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	Mar 2, 2026, 4:04 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 58.21%. Comparing base (b6685c1) to head (b5aebd0).
⚠️ Report is 1 commits behind head on main.

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

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2959      +/-   ##
==========================================
- Coverage   58.30%   58.21%   -0.10%     
==========================================
  Files        2108     2112       +4     
  Lines      173688   173501     -187     
==========================================
- Hits       101275   101002     -273     
- Misses      63392    63492     +100     
+ Partials     9021     9007      -14     

Flag	Coverage Δ
sei-chain-pr	49.05% <45.00%> (?)
sei-db	70.41% <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	70.35% <45.00%> (-1.26%)	⬇️

... and 59 files with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.