op-node: Fix pipeline transformer

[sebastianst]

Description

Changes None ForkName to equal empty, so that the pipeline doesn't try to transform stages on every single L1 origin advancement.

Additional context

The derivation pipeline currently tries to transform stages on every single L1 origin advancement 😅 it's ineffective since no stage has a none transformer though.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.24%. Comparing base (5686e3a) to head (ae93186).
Report is 2 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff              @@
##           develop   #16282       +/-   ##
============================================
+ Coverage    81.55%   96.24%   +14.68%     
============================================
  Files          161      106       -55     
  Lines         8866     4583     -4283     
============================================
- Hits          7231     4411     -2820     
+ Misses        1502      172     -1330     
+ Partials       133        0      -133     

Flag	Coverage Δ
cannon-go-tests-64	?
contracts-bedrock-tests	96.24% <ø> (ø)

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see 55 files with indirect coverage changes

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