fix: multiple repeated events and target subnet id

[atanmarko]

Description

Fix for parsing new events

Fixes TP-692

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

Patch coverage has no change and project coverage change: +0.03% 🎉

Comparison is base (6be52ee) 52.93% compared to head (07568f5) 52.97%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #296      +/-   ##
==========================================
+ Coverage   52.93%   52.97%   +0.03%     
==========================================
  Files         214      214              
  Lines       10522    10522              
==========================================
+ Hits         5570     5574       +4     
+ Misses       4952     4948       -4     

Files Changed	Coverage Δ
...opos-sequencer-subnet-runtime/src/certification.rs	0.00% <0.00%> (ø)

... and 1 file with indirect coverage changes

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