Fix empty stream name encountered in StorageApiFinalizeWrtiesDoFn

[Abacn]

Follow up #38264

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[reuvenlax]

I don't really understand this PR - can you explain it? The initializeContext/clearContexts structure is the one that has been there for a very long time, so I'm not sure why you're changing it.

[reuvenlax]

clearClients no longer even looks at failedContexts. We should simplify it and remove the parameter

[reuvenlax]

We should probably rename clearClients to resetClient

[Abacn]

I don't really understand this PR - can you explain it? The initializeContext/clearContexts structure is the one that has been there for a very long time, so I'm not sure why you're changing it.

Yeah agree that this part sounds less relevant. This is just an AI-assistent attempt and it doesn't look clear to me either. It's just for reference.

The part that moves streamName.write(""); around looks a bit more plausible. However in any case we'd need way (and time) to test it. In terms of release schedule would it be preferred to rollback (#38479) then roll forward to get a clean commit at release cut?