fix: allow ICS consumer to sign eth tx when proposer address comes from provider

[mmsqe]

Description

On ICS consumer chain, stakingKeeper.GetValidatorByConsAddr() fails on staking keeper since no validator record. The validator set is replicated via cross-chain validation module instead of local staking keeper. Validators of consumer are provided by the provider chain through Validator Set Change packets via IBC, no actual validator management in consumer's staking module.

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Author Checklist

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I have...

• tackled an existing issue or discussed with a team member
• left instructions on how to review the changes
• targeted the main branch

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 65.49%. Comparing base (84c2a0a) to head (203152c).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #917      +/-   ##
==========================================
- Coverage   65.49%   65.49%   -0.01%     
==========================================
  Files         318      318              
  Lines       22222    22217       -5     
==========================================
- Hits        14555    14550       -5     
  Misses       6502     6502              
  Partials     1165     1165              

Files with missing lines	Coverage Δ
x/vm/keeper/block_proposer.go	73.91% <100.00%> (-4.66%)	⬇️

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[vladjdk]

@mmsqe could you assign this to an issue with a description of why this is needed? We're in the process of deprecating ICS, so this may not be an issue in the future.

[mmsqe]

@mmsqe could you assign this to an issue with a description of why this is needed? We're in the process of deprecating ICS, so this may not be an issue in the future.

yes, but do you mean https://github.com/cosmos/interchain-security will be deprecated soon?