Change proeprty from IncludeRequestingHostName to ExcludeRequestingHost

[justinyoo]

Currently, it checks whether to include requesting host name or not:

azure-functions-openapi-extension/src/Microsoft.Azure.WebJobs.Extensions.OpenApi.Core/Configurations/DefaultOpenApiConfigurationOptions.cs

Line 39 in 1686213

public virtual bool IncludeRequestingHostName { get; set; } = IsFunctionsRuntimeEnvironmentDevelopment();

by using the hosting environment of Development

azure-functions-openapi-extension/src/Microsoft.Azure.WebJobs.Extensions.OpenApi.Core/Configurations/DefaultOpenApiConfigurationOptions.cs

Lines 108 to 113 in 1686213

	protected static bool IsFunctionsRuntimeEnvironmentDevelopment()
	{
	var development = Environment.GetEnvironmentVariable(FunctionsRuntimeEnvironmentKey) == "Development";
	return development;
	}

However, it would be more natural to change it to ExcludeRequstingHost and set to false by default.

Also, in addition to relying on the AZURE_FUNCTIONS_ENVIRONMENT value, devs can choose value through OpenApi__ExcludeRequestingHost.

[justinyoo]

Related to #390