Disable flaky JSON-RPC test

[rafaelroquetto]

The test is flaky, working only sometimes, and is preventing other PRs from progressing. It was first introduced by #161.

[rafaelroquetto]

Tracked at #273

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.81%. Comparing base (568eedf) to head (9292c41).
⚠️ Report is 838 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #272      +/-   ##
==========================================
+ Coverage   72.44%   76.81%   +4.36%     
==========================================
  Files         178      179       +1     
  Lines       19078    19507     +429     
==========================================
+ Hits        13822    14985    +1163     
+ Misses       4489     3735     -754     
- Partials      767      787      +20     

Flag	Coverage Δ
integration-test	56.63% <ø> (-0.02%)	⬇️
integration-test-arm	34.99% <ø> (-0.49%)	⬇️
k8s-integration-test	51.80% <ø> (?)
oats-test	35.04% <ø> (-0.46%)	⬇️
unittests	47.39% <ø> (+0.51%)	⬆️

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