[STO-237] remove unused cosmos invariants

[jewei1997]

Describe your changes and provide context

re-implementing these changes from a sei-cosmos PR that wasn't merged sei-protocol/sei-cosmos#593

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	Jan 20, 2026, 6:59 PM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 43.94%. Comparing base (e52b2a7) to head (914ec69).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2719      +/-   ##
==========================================
- Coverage   44.00%   43.94%   -0.07%     
==========================================
  Files        1980     1978       -2     
  Lines      162724   162479     -245     
==========================================
- Hits        71612    71403     -209     
+ Misses      84592    84577      -15     
+ Partials     6520     6499      -21     

Flag	Coverage Δ
sei-chain	46.19% <ø> (-0.01%)	⬇️
sei-cosmos	38.06% <100.00%> (-0.15%)	⬇️
sei-db	68.72% <ø> (ø)
sei-tendermint	47.17% <ø> (-0.12%)	⬇️

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

Files with missing lines	Coverage Δ
sei-cosmos/x/bank/keeper/invariants.go	0.00% <ø> (-45.32%)	⬇️
sei-cosmos/x/bank/module.go	44.59% <100.00%> (-0.74%)	⬇️
sei-cosmos/x/distribution/module.go	48.68% <100.00%> (-0.67%)	⬇️
sei-cosmos/x/gov/module.go	44.44% <100.00%> (-0.62%)	⬇️
sei-cosmos/x/staking/module.go	48.00% <100.00%> (-0.69%)	⬇️

... and 21 files with indirect coverage changes

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