Optionally use max parallelism value from the client settings API #5132
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Issue: Currently the default parallelism is set to 192, which is very high for busy machines. This causes timeouts and out of memory errors. There is an existing per-pipeline variable that can override this, but we cannot override the default globally without changing the agent.
Bug 2247830: DownloadPipelineArtifact throws OOMException
Description: This uses our existing client settings API to set the default if it is not overridden on a pipeline level. if the client setting is not available, it remains at the 192 default.
Risk Assesment(Low): We already use client settings for multiple other variables and it is only used if it is set and available and the value is not already overridden.
Added unit tests: (N)
Additional Tests Performed: Manually tested all permutations of pipeline variable override set/not set and client setting set/not set.