Add environment configuration to FiksIOSettings

[danielskovli]

Description

The Fiks IO client currently uses IHostEnvironment to decide which Fiks host to use:

app-lib-dotnet/src/Altinn.App.Clients.Fiks/FiksIO/FiksIOClient.cs

Lines 233 to 248 in 103aeb0

	private EnvironmentConfiguration GetConfiguration(AppIdentifier appIdentifier)
	{
	var ampqAppName = $"altinn-app-{appIdentifier.Org}-{appIdentifier.App}";
	return _env.IsProduction()
	? new EnvironmentConfiguration(
	ApiConfiguration.CreateProdConfiguration(),
	AmqpConfiguration.ProdHost,
	ampqAppName
	)
	: new EnvironmentConfiguration(
	ApiConfiguration.CreateTestConfiguration(),
	AmqpConfiguration.TestHost,
	ampqAppName
	);
	}

However, this is pretty invisible to the user, and potentially a bit inflexible.

Suggestion

Either expose an environment switch (test/prod) or expose the AMQP and API host values directly. Currently automagically provided by AmqpConfiguration.ProdHost and ApiConfiguration.CreateProdConfiguration() (and their test equivalents).

[olavsorl]

Writing unit tests remains