feat: merge-train/barretenberg (#16329)

See
[merge-train-readme.md](https://github.com/AztecProtocol/aztec-packages/blob/next/.github/workflows/merge-train-readme.md).

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feat: merge via append the ecc ops in hiding kernel (#16267)
Revert "feat: merge via append the ecc ops in hiding kernel (#16267)"
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Co-authored-by: AztecBot <[email protected]>
Co-authored-by: ludamad <[email protected]>

Author: 3 people