refactor: tce-broadcast config

[Freyskeyd]

Description

This PR aims to refactor some part of the TCE broadcast configuration.
It also remove some unused code such as StableSample event.

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

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (4ff2a23) 68.75% compared to head (c12f785) 69.21%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
...es/topos-p2p/src/runtime/handle_event/discovery.rs	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #444      +/-   ##
==========================================
+ Coverage   68.75%   69.21%   +0.45%     
==========================================
  Files         220      222       +2     
  Lines       12141    12135       -6     
==========================================
+ Hits         8348     8399      +51     
+ Misses       3793     3736      -57     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.