pkg/csconfig: use yaml.v3; deprecate yaml.v2 for new code #2867
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This allows us to parse time.Duration while unmarshaling, and have a proper error when the duration is provided as an integer without a unit (which is interpreted as nanoseconds with yaml.v2, forbidden with v3)
While v3 is better in all cases, there are a few API differences, so we are going to migrate over time.