fix: remove an unused channel that was locking the broadcast

[Freyskeyd]

Description

The broadcast on devnet-1 was stuck after some time.
It was because an unused channel was filling up by un-consumed messages and the N+1 message was waiting for slot that was never released.

PR Checklist:

• 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
• I have added or updated tests that comprehensively prove my change is effective or that my feature works

[gruberb]

👍

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (8fb4003) 66.95% compared to head (726af00) 68.72%.
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #433      +/-   ##
==========================================
+ Coverage   66.95%   68.72%   +1.77%     
==========================================
  Files         220      220              
  Lines       12109    12102       -7     
==========================================
+ Hits         8107     8317     +210     
+ Misses       4002     3785     -217     

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