Improve governance client validation

[Fraccaman]

Describe your changes

Checklist before merging

• If this PR has some consensus breaking changes, I added the corresponding breaking:: labels
  • This will require 2 reviewers to approve the changes

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 31 lines in your changes missing coverage. Please review.

Project coverage is 61.27%. Comparing base (f08d3f2) to head (6e7002e).
Report is 37 commits behind head on main.

Files	Patch %	Lines
crates/sdk/src/rpc.rs	0.00%	24 Missing ⚠️
crates/governance/src/cli/onchain.rs	0.00%	3 Missing ⚠️
crates/governance/src/cli/validation.rs	0.00%	2 Missing ⚠️
crates/sdk/src/tx.rs	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3629      +/-   ##
==========================================
- Coverage   61.28%   61.27%   -0.02%     
==========================================
  Files         312      312              
  Lines      101337   101328       -9     
==========================================
- Hits        62103    62084      -19     
- Misses      39234    39244      +10     

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[grarco]

LGTM!