Fix WebProxy address format in sample

[MihaZupan]

No description provided.

[adityamandaleeka]

Did this not work before this change, or is this cleanup due to schema validation hygiene?

[MihaZupan]

I added the WebProxy part to this config while adding the schema support as it was one of the few features that weren't showcased (we could choose to remove the WebProxy part as well since it's a sample). In this case this config is valid by the schema, but results in an error at runtime due to the url not being valid.

The reason why I chose not to enforce uri formats on these settings as part of the schema is that we support rewriting strings at runtime with config filters, e.g.

yarp/samples/ReverseProxy.ConfigFilter.Sample/appsettings.json

Lines 40 to 43 in f0d7e5d

	"cluster1/destination1": {
	// Following value will be found by regex and looked up as an environment variable
	"Address": "{{contoso}}"
	},

And we do have a test where all appsettings.json in the repo are validated against the schema.

yarp/test/ReverseProxy.Tests/Configuration/ConfigProvider/ConfigurationConfigProviderTests.cs

Line 676 in f0d7e5d

public async Task ValidateSchema_Samples()