add workflow ID command

[tarcisiozf]

TICKET: DEVSVCS-2981

Refactoring and modularization:

• Replaces the internal workflowArtifact struct with the new shared artifact.Artifact type throughout the deploy and register code, and updates test code accordingly.
• Refactors the workflow compilation logic to use the new build package for resolving build parameters and compiling workflows, removing duplicated code and simplifying the Compile method.
• Refactors artifact preparation to use the new artifact.Builder and artifact.Inputs, replacing custom logic for reading and encoding binaries and configs.

New features:

• Adds a new workflow id subcommand that builds the workflow and prints its computed ID, using the shared artifact and build logic. (cmd/workflow/id/id.go)

General improvements:

• Fix potential memory leak by closing brotli.NewWriter
• Improve error messages when Anvil fails