[DO NOT MERGE] submit_request brew builds

[owtaylor]

This PR adds a brew_builds parameter to the submit_request tool. I'm not too happy with it - I feel that more of the flexibility of the artifacts parameter in the API is needed - but I don't know exactly what part of that flexibility will be needed.

Is it better to to just have a artifacts parameter that literally matches the API and takes a list of:

class Artifact(TypedDict):
   id: str
   type: ArtifactType
   packages: NotRequired[list[str]]
   install: NotRequired[boolean]
   order: NotRequired[int]

?

[thrix]

@owtaylor sorry was busy with some other things, will check what we could do here

[owtaylor]

@owtaylor sorry was busy with some other things, will check what we could do here

This isn't anything that we're using currently - with Project Jötnar, the main use of testing farm at the moment goes through the API rather than any sort of MCP. So use it as feedback if it's useful, otherwise feel free to close.