op-batcher: remove preferLocalSafeL2 flag

[geoknee]

This behavior now becomes the default (in fact, the only) behavior. We only had this configurable before to cope with bugs in op-node which we believe are now either fixed or worked around adequately by the batcher.

#16298
#16296

[codecov]

Codecov Report

Attention: Patch coverage is 88.88889% with 1 line in your changes missing coverage. Please review.

Project coverage is 41.39%. Comparing base (b227d03) to head (84fed65).

Files with missing lines	Patch %	Lines
op-batcher/batcher/driver.go	0.00%	1 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (b227d03) and HEAD (84fed65). Click for more details.

HEAD has 5 uploads less than BASE

Flag	BASE (b227d03)	HEAD (84fed65)
cannon-go-tests-64	3	0
contracts-bedrock-tests	2	0

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #16413      +/-   ##
===========================================
- Coverage    47.08%   41.39%   -5.69%     
===========================================
  Files         1388     1197     -191     
  Lines       112185   100591   -11594     
===========================================
- Hits         52819    41644   -11175     
+ Misses       55658    55507     -151     
+ Partials      3708     3440     -268     

Flag	Coverage Δ
cannon-go-tests-64	?
contracts-bedrock-tests	?

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

Files with missing lines	Coverage Δ
op-batcher/batcher/config.go	35.95% <ø> (+0.39%)	⬆️
op-batcher/batcher/service.go	0.00% <ø> (ø)
op-batcher/batcher/sync_actions.go	100.00% <100.00%> (ø)
op-batcher/flags/flags.go	63.33% <ø> (ø)
op-batcher/batcher/driver.go	15.04% <0.00%> (ø)

... and 258 files with indirect coverage changes

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