Add new tests for eth_subscribe

[manuelmauro]

What does it do?

Adds new tests for eth_subscribe.

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch manuel/test-reorgs-in-eth-subscribe

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[github-actions]

WASM runtime size check:

Compared to target branch

Moonbase runtime: 2124 KB (no changes) ✅

Moonbeam runtime: 2240 KB (no changes) ✅

Moonriver runtime: 2240 KB (no changes) ✅

Compared to latest release (runtime-4100)

Moonbase runtime: 2124 KB (+188 KB compared to latest release) ⚠️

Moonbeam runtime: 2240 KB (+208 KB compared to latest release) ⚠️

Moonriver runtime: 2240 KB (+208 KB compared to latest release) ⚠️

[github-actions]

Coverage Report

@@                           Coverage Diff                           @@
##           master   manuel/test-reorgs-in-eth-subscribe      +/-   ##
=======================================================================
+ Coverage   76.70%                                76.71%   +0.01%     
  Files         389                                   389              
- Lines       76595                                 76585      -10     
=======================================================================
  Hits        58745                                 58745              
- Misses      17850                                 17840      -10     

Files Changed	Coverage
/node/service/src/lib.rs	49.01% (+0.48%)	🔼

Coverage generated Thu Dec 18 11:56:05 UTC 2025

[manuelmauro]

Closing in favor of #3597