refactor(verification): remove VertexVerifier from BlockVerifier [part 7/9]

[glevco]

Depends on #835

Motivation

Simplify code by removing the VertexVerifier composition from BlockVerifier.

Acceptance Criteria

• Remove BlockVerifier.verify_outputs(), moving its only custom verification to a new verify_output_token_indexes() method, and moving its call to VerificationService._verify_without_storage_block(). This allows us to remove the VertexVerifier composition from BlockVerifier.
• Update usages accordingly.
• No behavior should be changed by this PR.

Checklist

• If you are requesting a merge into master, confirm this code is production-ready and can be included in future releases as soon as it gets merged

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (3b5a3b8) 85.34% compared to head (7af542d) 85.30%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #836      +/-   ##
==========================================
- Coverage   85.34%   85.30%   -0.05%     
==========================================
  Files         283      283              
  Lines       22418    22416       -2     
  Branches     3397     3397              
==========================================
- Hits        19133    19121      -12     
- Misses       2602     2608       +6     
- Partials      683      687       +4     

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