Enable JSONSchema property decorator to inform synthetic test to skip

[SteveL-MSFT]

Summary of the new feature / enhancement

Some properties passed to a resource are instructions rather than properties informing state. In the WindowsFirewallRules resource, the unspecifiedRule is an example. Since it's not canonical, the engine doesn't know anything about it and during synthetic test it will compare the input and output such that when this property is used, it will fail the comparison since the default ignore is also unspecified.

Proposed technical implementation details (optional)

Add support for x-instruction to JSONSchema which will inform the DSC engine to not compare that particular property.

[SteveL-MSFT]

Thinking about this further, we could have the DSC engine simply use the default value, if specified, in the JSON Schema for the comparison if not specified in the object.

[SteveL-MSFT]

Closing this since using the default seems correct to fix the reported issue

[SteveL-MSFT]

Reopening as default value doesn't solve all cases.

It may make sense to converge this with the idea to pass options to extensions, so calling it x-option instead of x-instruction may make sense.