[TASK] Strip testing fetchers when baking blueprint.json

[Serial-ATA]

Overview

We currently retain all fetchers when baking the blueprint: https://github.com/tangle-network/blueprint/blob/27bc2432e914177e60576c79d5bb4a2b7803fcc3/cli/src/deploy/tangle.rs#L416-L420

That's an issue for Testing fetchers, which will contain a local path. Developers will not want their local paths submitted on-chain.