[CI] Decouple deploying contracts from compilation

[Marcin-Radecki]

We won't need to deploy contracts every time for the default branch CI, so I've split the main workflow into two parts: compilation and deployments.

Testing:

• Deployment works (you can mark checkbox as true): https://github.com/Cardinal-Cryptography/most/actions/runs/11574365250/job/32223269296
• Master branch pipeline: https://github.com/Cardinal-Cryptography/most/actions/runs/11576040917 - by default the new deploy flag is set to false