fix(network): dont check fin in network manager

[ShahakShama]

This change is 

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 10 lines in your changes missing coverage. Please review.

Project coverage is 68.42%. Comparing base (25c2370) to head (a72d671).
Report is 3 commits behind head on main.

Files	Patch %	Lines
crates/papyrus_network/src/network_manager/mod.rs	66.66%	6 Missing and 4 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2114      +/-   ##
==========================================
+ Coverage   68.40%   68.42%   +0.02%     
==========================================
  Files         132      132              
  Lines       17602    17602              
  Branches    17602    17602              
==========================================
+ Hits        12041    12045       +4     
+ Misses       4226     4223       -3     
+ Partials     1335     1334       -1     

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[asmaastarkware]

Reviewed 2 of 2 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @ShahakShama)

[matan-starkware]

Reviewed 1 of 2 files at r1, 1 of 1 files at r2, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @ShahakShama)