Remove oracle price-feeder executable

[masih]

Proposal 110 deprecated the Oracle. From then on there is no need to run oracle price feeder.

The work here removes oracle price feeder process across sei-chain and integration testing setup.

See:

• https://www.mintscan.io/sei/proposals/110

[github-actions]

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Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Mar 5, 2026, 2:22 PM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 58.28%. Comparing base (5970d05) to head (5ae2ed2).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3015      +/-   ##
==========================================
- Coverage   58.40%   58.28%   -0.12%     
==========================================
  Files        2110     2108       -2     
  Lines      175011   173711    -1300     
==========================================
- Hits       102208   101246     -962     
+ Misses      63775    63437     -338     
  Partials     9028     9028              

Flag	Coverage Δ
sei-chain-pr	67.69% <ø> (?)
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
precompiles/oracle/oracle.go	59.57% <ø> (-8.95%)	⬇️

... and 33 files with indirect coverage changes

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[arajasek]

Do it!