graphql: dev: chg: avoid greedy allocation on graphql blocks call

[marcello33]

Description

Please, refer to ethereum/go-ethereum#27873

Changes

• Bugfix (non-breaking change that solves an issue)
• Hotfix (change that solves an urgent issue, and requires immediate attention)
• New feature (non-breaking change that adds functionality)
• Breaking change (change that is not backwards-compatible and/or changes current functionality)
• Changes only for a subset of nodes

Checklist

• I have added at least 2 reviewer or the whole pos-v1 team
• I have added sufficient documentation in code
• I will be resolving comments - if any - by pushing each fix in a separate commit and linking the commit hash in the comment reply
• Created a task in Jira and informed the team for implementation in Erigon client (if applicable)
• Includes RPC methods changes, and the Notion documentation has been updated

Testing

• I have added unit tests
• I have added tests to CI
• I have tested this code manually on local environment
• I have tested this code manually on remote devnet using express-cli
• I have tested this code manually on mumbai
• I have created new e2e tests into express-cli

Manual tests

Executed scripts as per bb22944 Immunify report

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.04% ⚠️

Comparison is base (d495949) 57.08% compared to head (a4b469d) 57.05%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #958      +/-   ##
===========================================
- Coverage    57.08%   57.05%   -0.04%     
===========================================
  Files          633      633              
  Lines        77324    77326       +2     
===========================================
- Hits         44141    44117      -24     
- Misses       29417    29445      +28     
+ Partials      3766     3764       -2     

Files Changed	Coverage Δ
graphql/graphql.go	32.03% <0.00%> (-0.10%)	⬇️

... and 31 files with indirect coverage changes

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