Fix integration tests assertions

[grarco]

Describe your changes

Updates assert_success in integration tests to avoid ignoring missing results.
Fixes wrong usage of the same function in conjunction with Client commands that don't modify the auxiliary fields of InnerMockNode.

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 (7ac415a) to head (e2ad712).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3902   +/-   ##
=======================================
  Coverage   73.24%   73.24%           
=======================================
  Files         341      341           
  Lines      105240   105240           
=======================================
  Hits        77085    77085           
  Misses      28155    28155           

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