refactor: minimize redundant requests in prepareTransactionRequest

[jxom]

Addresses #2017

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PR-Codex overview

This PR focuses on minimizing redundant requests in the prepareTransactionRequest function by optimizing fee calculations.

Detailed summary

• Removed redundant getBlock request
• Optimized fee calculations based on request parameters
• Improved error handling for fee calculations

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Name	Status	Preview	Updated (UTC)
viem	✅ Ready (Inspect)	Visit Preview	Mar 26, 2024 8:33pm

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🦋 Changeset detected

Latest commit: 98f6936

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
viem	Patch

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.40%. Comparing base (a5675ab) to head (f18bbe1).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2021      +/-   ##
==========================================
- Coverage   99.73%   96.40%   -3.34%     
==========================================
  Files         594      594              
  Lines       53949    53906      -43     
  Branches     2602     2271     -331     
==========================================
- Hits        53804    51966    -1838     
- Misses        130     1917    +1787     
- Partials       15       23       +8     

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