Validate blockhash that the relayer responds with

[avalonche]

📝 Summary

Validates the block hash the relay responds with the hash calculated from the relay block.

⛱ Motivation and Context

Resolves https://github.com/flashbots/mev-boost/issues/280

📚 References

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✅ I have run these commands

• [x] make lint
• [x] make test-race
• [x] go mod tidy

[codecov-commenter]

Codecov Report

Merging #299 (fe3fd51) into main (6f3cfda) will decrease coverage by 0.40%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #299      +/-   ##
==========================================
- Coverage   83.45%   83.05%   -0.41%     
==========================================
  Files           5        5              
  Lines         659      667       +8     
==========================================
+ Hits          550      554       +4     
- Misses         83       86       +3     
- Partials       26       27       +1     

Flag	Coverage Δ
unittests	83.05% <100.00%> (-0.41%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
server/mock_relay.go	86.75% <100.00%> (ø)
server/service.go	82.25% <100.00%> (-0.66%)	:arrow_down:

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