Refactor newL1Client function in node.go

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 78.41%. Comparing base (b89e078) to head (3b4b318). Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
node/node.go	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2128 +/- ## ========================================== + Coverage 78.38% 78.41% +0.03% ========================================== Files 100 100 Lines 9225 9221 -4 ========================================== Hits 7231 7231 + Misses 1357 1353 -4 Partials 637 637 ```

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