op-node: safer genesis script

[tynes]

Description

Updates the op-node genesis gen script to prevent nil pointer access accidentally. Run the command like so:

go run op-node/cmd/main.go genesis l2 \
  --deploy-config $PWD/packages/contracts-bedrock/deploy-config/mainnet.json \
  --outfile.l2 l2.json \
  --outfile.rollup rollup.json \
  --l1-rpc $ETH_RPC_URL \
  --deployment-dir $PWD/packages/contracts-bedrock/deployments/mainnet

When generating the genesis file, it is ok to leave the l1StartingBlockTag value as undefined, this script will select an appropriate value and then the value will end up inside of the rollup config under .genesis.l1.hash which can then be backported to the deploy config to make the script deterministic.

A clear and concise description of the features you're adding in this pull request.

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Latest commit: a8a4b22

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[clabby]

nice!

[codecov]

Codecov Report

Merging #6456 (74305be) into develop (d6698a4) will increase coverage by 3.17%.
Report is 1 commits behind head on develop.
The diff coverage is 0.00%.

❗ Current head 74305be differs from pull request most recent head 4f4afaa. Consider uploading reports for the commit 4f4afaa to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #6456      +/-   ##
===========================================
+ Coverage    40.74%   43.92%   +3.17%     
===========================================
  Files          465      313     -152     
  Lines        33461    24951    -8510     
  Branches      1949        0    -1949     
===========================================
- Hits         13634    10959    -2675     
+ Misses       18350    12982    -5368     
+ Partials      1477     1010     -467     

Flag	Coverage Δ
bedrock-go-tests	43.92% <0.00%> (-0.02%)	⬇️
cannon-go-tests	?
chain-mon-tests	?
common-ts-tests	?
contracts-bedrock-tests	?
contracts-ts-tests	?
core-utils-tests	?
sdk-next-tests	?
sdk-tests	?

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Files Changed	Coverage Δ
op-node/cmd/genesis/cmd.go	0.00% <0.00%> (ø)

... and 154 files with indirect coverage changes

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[mergify]

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