azure-pipelines.yml: Decreased maximum number of allowed failures to 4 per target framework/OS combo
azure-pipelines.yml: Decreased maximum number of allowed failures to 4 per target framework/OS combo

apache/lucenenet,jeme/lucenenet,apache/lucenenet,NightOwl888/lucenenet,sisve/lucenenet,sisve/lucenenet,NightOwl888/lucenenet,jeme/lucenenet,apache/lucenenet,apache/lucenenet,jeme/lucenenet,NightOwl888/lucenenet,jeme/lucenenet,NightOwl888/lucenenet