Fix reading ExecuteOperationMetadata in UpdateBotSession calls
Before raising this MR, consider whether the following are required, and complete if so:
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Unit tests
Description
The logstream functionality in buildbox-worker has been broken for quite some time (no idea who buildbox-worker not ever parsing the logstream locations from UpdateBotSession responses. This PR fixes that, and adds tests to verify.
Issues addressed
Accidental breakage of logstreaming