fix: block handling during certificate generation

[atanmarko]

Description

Handle removal of subnet blocks from the list when generating certificates

Fixes TP-786

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: Patch coverage is 0% with 22 lines in your changes are missing coverage. Please review.

Project coverage is 71.86%. Comparing base (96e862f) to head (406f11e).

Files	Patch %	Lines
...opos-sequencer-subnet-runtime/src/certification.rs	0.00%	19 Missing ⚠️
crates/topos-sequencer-subnet-runtime/src/lib.rs	0.00%	2 Missing ⚠️
crates/topos-sequencer-subnet-runtime/src/proxy.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #471      +/-   ##
==========================================
- Coverage   71.96%   71.86%   -0.10%     
==========================================
  Files         225      225              
  Lines       12659    12675      +16     
==========================================
- Hits         9110     9109       -1     
- Misses       3549     3566      +17     

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[dvdplm]

I don't fully understand why we keep the finalized blocks in linked list as opposed to a vec or a hashmap, but that's not the main point of this pr.

[atanmarko]

I don't fully understand why we keep the finalized blocks in linked list as opposed to a vec or a hashmap, but that's not the main point of this pr.

We remove blocks from the beginning and add them to the end of the list and they need to keep order. I believe a linked list is the most optimal structure for this. VecDeque could also do the job (but less optimal if a number of blocks grows a lot because it is a ring buffer)