test/e2e: try to clean-up gaiad

[tzemanovic]

Describe your changes

follow-up to #3894 to forward a Ctrl+C signal to the cmd inner session

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
• If this PR requires changes to the docs or specs, a corresponding PR is opened in the namada-docs repo
  • Relevant PR if applies:
• If this PR affects services such as namada-indexer or namada-masp-indexer, a corresponding PR is opened in that repo
  • Relevant PR if applies:

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.24%. Comparing base (514f581) to head (315f763).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3907      +/-   ##
==========================================
- Coverage   73.25%   73.24%   -0.01%     
==========================================
  Files         341      341              
  Lines      105240   105240              
==========================================
- Hits        77089    77085       -4     
- Misses      28151    28155       +4     

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