Execute codeflow logic directly

[premun]

Context

Before, Maestro would call PCS when a code flow subscription was triggered.
Now we can call the code flow logic directly and perform the update.

However, because we are migrating step by step, we are now instead of this just creating a code flow work item which will be picked up by the processor later. This is inefficient but mimics the previous architecture.

Goal

Instead of the async communication back and forth between PCS and Maestro, and instead of the async resolution of code flow subscription triggers by processing it over several work items, we should just execute code flow subscriptions right away.

[premun]

I think this one belongs into Unified Build really so closing