feat(taiko-client): add checks to ensure preconfirmation blocks are based on canonical chain

[davidtaikocha]

This will introduce an O(n) search through RPC calls when the preconf block is in another (valid / invalid) fork, we can optimize it by moving the search to a new taiko-geth RPC method later.

[Copilot]

Pull Request Overview

This PR adds a check to ensure that preconfirmation blocks belong to the canonical chain by fetching the canonical parent block and validating its hash against the provided executable data.

• Fetch the canonical parent block via the L2 header API.
• Compare the canonical parent's hash with that of the executable data and return an error if they do not match.

[Copilot]

Pull Request Overview

This PR adds validations to ensure that preconfirmation blocks are part of the canonical chain. It introduces stricter error messages in the preconfirmation check and implements a new helper function (IsInCanonicalChain) to traverse and verify the chain linkage.

[codecov]

Codecov Report

Attention: Patch coverage is 24.32432% with 28 lines in your changes missing coverage. Please review.

Project coverage is 38.58%. Comparing base (efe2d99) to head (c289cff).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...river/chain_syncer/event/blocks_inserter/pacaya.go	24.32%	23 Missing and 5 partials ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
...river/chain_syncer/event/blocks_inserter/pacaya.go	69.12% <24.32%> (-6.38%)	⬇️

... and 1 file with indirect coverage changes

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