Make check of azure permission case-insensitive
Make check of azure permission case-insensitive

PiperOrigin-RevId: 343094298

GoogleCloudPlatform/PerfKitBenchmarker,GoogleCloudPlatform/PerfKitBenchmarker,GoogleCloudPlatform/PerfKitBenchmarker,GoogleCloudPlatform/PerfKitBenchmarker