isOnPrem not passed down correctly when invoking GetAuthorityFromTargetServiceAsync

[janis-veinbergs]

The following method call is not passing isOnPrem variable correctly:

PowerPlatform-DataverseServiceClient/src/GeneralTools/DataverseClient/Client/Auth/AuthProcessor.cs

Line 93 in 447f9dc

var details = GetAuthorityFromTargetServiceAsync(ClientServiceProviders.Instance.GetService<IHttpClientFactory>(), processResult.TargetServiceUrl, logSink).ConfigureAwait(false).GetAwaiter().GetResult();

Thus it prevents falling through invalid WWW-Authenticate headers downstream:

PowerPlatform-DataverseServiceClient/src/GeneralTools/DataverseClient/Client/Auth/AuthorityResolver.cs

Lines 112 to 113 in 447f9dc

	if (isOnPrem)
	continue;