Increase stacks client coverage

[CAGS295]

Summary of Changes

Refactored error handling and added tests.

Testing

Risks

I touched on a few methods without tests. It could have changed the behavior slightly. I checked that none of the callers relied on the old logic, but I could have missed something.

How were these changes tested?

Static analysis and added unit tests.

What future testing should occur?

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[codecov]

Codecov Report

Attention: 118 lines in your changes are missing coverage. Please review.

Comparison is base (6470223) 43.44% compared to head (76bcb4c) 47.85%.
Report is 4 commits behind head on main.

❗ Current head 76bcb4c differs from pull request most recent head 41990f1. Consider uploading reports for the commit 41990f1 to get more accurate results

Files	Patch %	Lines
romeo/src/stacks_client.rs	68.45%	94 Missing ⚠️
romeo/src/system.rs	0.00%	24 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #347      +/-   ##
==========================================
+ Coverage   43.44%   47.85%   +4.41%     
==========================================
  Files          45       45              
  Lines        5467     5567     +100     
  Branches       47       47              
==========================================
+ Hits         2375     2664     +289     
+ Misses       3091     2902     -189     
  Partials        1        1              

Flag	Coverage Δ
unittests	76.61% <ø> (ø)

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[CLAassistant]

All committers have signed the CLA.