Cleaned up description decorator logic to allow loops

[TSunny007]

Fixed #5099

[anthony-c-martin]

I think it would be good to be more precise here, just in case something totally crazy happens in the future.

You should be able to write assertions like the following (for resources):

bicep/src/Bicep.Core.IntegrationTests/ScenarioTests.cs

Lines 207 to 208 in 223b8d2

	result.Template.Should().HaveValueAtPath("$.resources[?(@.name == 'rg30')].location", "[deployment().location]");
	result.Template.Should().HaveValueAtPath("$.resources[?(@.name == 'rg31')].location", "[deployment().location]");

Or for variables:

bicep/src/Bicep.Core.IntegrationTests/ScenarioTests.cs

Lines 357 to 358 in 223b8d2

	result.Template.Should().HaveValueAtPath("$.resources[?(@.name == '[variables(\\'vnetName\\')]')].properties.parameters.subnets.value[0].name", "GatewaySubnet");
	result.Template.Should().HaveValueAtPath("$.resources[?(@.name == '[variables(\\'vnetName\\')]')].properties.parameters.subnets.value[1].name", "appsn01");

[anthony-c-martin]

Looks good!