(SCHEMA) Fix metadata for dsc config output

Prior to this change, the output metadata erroneously required the
`context` property, which is sent _to_ resources but not returned
for configuration operations themselves.

Author: michaeltlombardi

schemas/src/metadata/configurationDocumentResult.yaml

@@ -30,7 +30,6 @@ properties:
       - endDatetime
       - duration
       - securityContext
-      - context
     properties:
       version:
         $ref: /<PREFIX>/<VERSION>/metadata/Microsoft.DSC/version.yaml
@@ -46,5 +45,3 @@ properties:
         $ref: /<PREFIX>/<VERSION>/metadata/Microsoft.DSC/duration.yaml
       securityContext:
         $ref: /<PREFIX>/<VERSION>/metadata/Microsoft.DSC/securityContext.yaml
-      context:
-        $ref: /<PREFIX>/<VERSION>/metadata/Microsoft.DSC/context.yaml