Change block timestamp fetching to use header only

[rokn]

Signed-off-by: Antonio Mindov antonio.mindov@limechain.tech

Detailed description: This should fix the transaction fetching from Arbitrum and Optimism

Special notes for your reviewer:

Checklist

• [ ] Documentation added
• [ ] Tests updated

[codecov[bot]]

Codecov Report

Merging #821 (d8f6b79) into main (eb9a728) will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #821   +/-   ##
=======================================
  Coverage   64.34%   64.34%           
=======================================
  Files          88       88           
  Lines        6722     6722           
=======================================
  Hits         4325     4325           
  Misses       2178     2178           
  Partials      219      219           

Flag	Coverage Δ
unittests	64.34% <100.00%> (ø)

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

Impacted Files	Coverage Δ
app/clients/evm/client.go	47.97% <100.00%> (ø)

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