Cancel MerkleTreeComputer futures on interrupts

[fmeum]

Merkle tree computations and uploads should not continue after a build has been interrupted.

[Copilot]

Pull Request Overview

This PR adds interrupt handling to the MerkleTreeComputer class to properly cancel ongoing futures when a build is interrupted. This ensures that merkle tree computations and uploads don't continue unnecessarily after interruption signals are received.

• Added interrupt exception handling to cancel futures on interrupts
• Ensures proper cleanup of running futures when builds are cancelled

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}