Agent sessions single view: standardize the session item entries

[osortega]

Testing #274477

It looks strange to me how each session looks very different from each other depending on the provider, specially right now Copilot cloud vs anything else.
I like that we are showing the state in the description, should we standardize that and show that for all regardless of the provider? And if we do that, should we just remove the icon on the right?

[bpasero]

@osortega can you please take this and update what the copilot remote provider returns? I think just the bare PR number is a bit thin, how about Finished in <PR>?