Add support for Arm64 Windows

[mherrmann]

The same tests fail as before. On x64 Windows 10:

• TimeTest.RFC822TimeParsing
• OmahaCustomizationTest.IsInternalUser
• PingTest.BuildOmahaPing
• PingTest.SendInProcess
• PingTest.PersistAndSendPersistedPings
• WebServicesClientTest.Send
• WebServicesClientTest.SendForcingHttps
• WebServicesClientTest.SendWithCustomHeader
• WebServicesClientTest.SendStringWithCustomHeader
• InstallManagerInstallAppMachineTest.InstallApp_MsiInstallerSucceeds
• InstallManagerInstallAppMachineTest.InstallApp_MsiInstallerWithArgumentSucceeds
• InstallerWrapperMachineTest.InstallApp_MsiInstallerSucceeds
• InstallerWrapperMachineTest.InstallApp_MsiInstallerWithArgumentSucceeds
• WorkerWithTwoAppsTest.CheckForUpdateAsync_Large
• WorkerWithTwoAppsTest.DownloadAsyncThenDownloadAndInstallAsync_Large
• CupEcdsaRequestTest.PostSimpleRequest
• CupEcdsaRequestTest.PostSimpleRequestHttps
• NetworkRequestTest.MultipleRequests
• GoogleUpdateRecoveryTest.FixGoogleUpdate_FileReturned_Machine
• GoogleUpdateRecoveryTest.FixGoogleUpdate_FileReturned_User
• GoogleUpdateRecoveryTest.FixGoogleUpdate_FileCollision
• GoogleUpdateRecoveryTest.VerifyFileSignature_SignedValid
• GoogleUpdateRecoveryTest.ProductionServerResponseTest
• SetupUserTest.TerminateCoreProcesses_BothTypesRunningAndSimilarArgsProcess
• SetupMachineTest.StopGoogleUpdateAndWait_ProcessesDoNotStop
• SetupMachineTest.StopGoogleUpdateAndWait_UserHandoffWorkerRunningAsSystem
• SetupMachineTest.StopGoogleUpdateAndWait_UserLegacyInstallGoogleUpdateWorkerRunningAsSystem
• SetupMachineTest.TerminateCoreProcesses_BothTypesRunningAndSimilarArgsProcess
• UnitTestHelpersTest.ClearGroupPolicies
• IsForeground/WebServicesClientTest.SendUsingCup/0, where GetParam() = false
• IsForeground/WebServicesClientTest.SendUsingCup/1, where GetParam() = true
• IsForeground/WebServicesClientTest.SendString/0, where GetParam() = false
• IsForeground/WebServicesClientTest.SendString/1, where GetParam() = true

Additionally, on Arm64 Windows 11, the following tests failed before and also fail now:

• UserInfoTest.GetProcessUserSid
• VistaUtilTest.IsUACOn
• VistaUtilTest.IsElevatedWithUACOn
• GoopdateUtilsTest.ResetUserId_MACHashes
• GoopdateUtilsTest.ResetUserIdIfMacMismatch
• NetworkConfigTest.GetProxyForUrlLocal