op-chain-ops: cleanup default gas limit

[tynes]

Description

Use a single default value for when configuring the genesis value of the block gas limit for both L1 and L2 when it is not set in the deploy config. The value defaults to 30 million when it is not explicitly set.

This PR is slowly moving changes out of #6123 into their own smaller PRs so that they can be merged in independently of the final functionality.

[changeset-bot]

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Latest commit: 494d517

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[codecov]

Codecov Report

Merging #6430 (494d517) into develop (a19535e) will increase coverage by 3.27%.
The diff coverage is 50.00%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #6430      +/-   ##
===========================================
+ Coverage    40.58%   43.86%   +3.27%     
===========================================
  Files          464      312     -152     
  Lines        33378    24857    -8521     
  Branches      1949        0    -1949     
===========================================
- Hits         13546    10903    -2643     
+ Misses       18356    12947    -5409     
+ Partials      1476     1007     -469     

Flag	Coverage Δ
bedrock-go-tests	43.86% <50.00%> (+<0.01%)	⬆️
cannon-go-tests	?
chain-mon-tests	?
common-ts-tests	?
contracts-bedrock-tests	?
contracts-ts-tests	?
core-utils-tests	?
sdk-next-tests	?
sdk-tests	?

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

Files Changed	Coverage Δ
op-chain-ops/genesis/layer_one.go	74.74% <0.00%> (ø)
op-chain-ops/genesis/genesis.go	86.20% <100.00%> (ø)

... and 153 files with indirect coverage changes

[mergify]

This PR has been added to the merge queue, and will be merged soon.

[mergify]

This PR is next in line to be merged, and will be merged as soon as checks pass.