Switch monorepo to npm core package

[flopez7]

Description
Update monorepo to consume @human-protocol/core from npm instead of workspace:*, and split contract deployment + release workflows from the current cd-packages.yaml so npm publishing (and its changesets) runs before merging to develop.

Motivation
Using the published npm package removes the per-build core compilation step, cutting build times (previously ~15 minutes) for several packages. We also keep the repo history intact and can still switch back to workspace:* when local contract changes are needed

Implementation details

• Replace all @human-protocol/core: workspace:* dependencies across services/packages with the npm latest version.
• Decouple contract deployment and releases from cd-packages.yaml into a dedicated workflow that can run earlier.
• Create a separate changeset configuration for the core package release flow, and run it before changes land in develop.
• Ensure CI/tests use the published package by default, with an option to switch back to workspace:* for local dev.