e2e: remove unused skipRunValidatorIndexes

[p0mvn]

Closes: #XXX

What is the purpose of the change

This was originally meant to be used for initializing genesis and configs for state-sync nodes and be able to run them after the rest of the chain has started. However, a new design was chosen over this where we have the ability to initialize the configs for a single node, separate from the rest of the chain

As a result, this logic is not needed anymore

Documentation and Release Note

• Does this pull request introduce a new feature or user-facing behavior changes? no
• Is a relevant changelog entry added to the Unreleased section in CHANGELOG.md? no
• How is the feature or change documented? not applicable

[czarcas7ic]

I am glad we are doing away with this, it was just one more thing to remember to do when going through the setup process (also it oddly took a long time to just skip the validator, at least when looking at the logs)

[p0mvn]

@czarcas7ic thanks for quick reviews everywhere