[8.0.4xx] Fix serialization of TelemetryEventArgs data packets across MSBuild worker nodes #10464
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Fixes azdo#2174440
Context
The serialization of telemetry events assumed that telemetry properties would always have a value - it seems like it's possible for callers to send null values, so we need to be able to handle that. This was triggered with the addition of containers telemetry added in 8.0.400.
Changes Made
Optionally write and read the value string for the telemetry event payload.
Testing
Added previously-nonexistent round-tripping tests for this event type.
Notes
We'll want to take this to SDK Tactics for servicing, but then to VS QB to see if they want to align releases or let the VS side drift a bit.