feat(taiko-client): improve isBatchPreconfirmed

[davidtaikocha]

No description provided.

[Copilot]

Pull Request Overview

This PR improves the implementation of isBatchPreconfirmed by parallelizing the per-block preconfirmation checks.

• Introduces parallel execution using an error group for each block in the batch.
• Adjusts header retrieval and updates to use a newly obtained parent header in place of the original parent.

[codecov]

Codecov Report

Attention: Patch coverage is 86.04651% with 6 lines in your changes missing coverage. Please review.

Project coverage is 38.63%. Comparing base (1dce498) to head (fa3abac).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
...river/chain_syncer/event/blocks_inserter/common.go	86.04%	4 Missing and 2 partials ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
...river/chain_syncer/event/blocks_inserter/common.go	65.60% <86.04%> (+0.84%)	⬆️

... and 1 file with indirect coverage changes

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