Use friendly topic name during creation a subscription

When creating a subscription in the request body the name of the topic should be simple like:

 {
    "name":"Test ",
    "description": "Creating subscription manually",
    "pushEndpoint":"url",
    "topic":**"recordstopic"**,
    "secret": { "secretType":"HMAC", "value":"xx" }
 }

instead of

 {
    "name":"Test ",
    "description": "Creating subscription manually",
    "pushEndpoint":"url",
    "topic":**"${azure-resource-group}-grid-recordstopic"**,
    "secret": { "secretType":"HMAC", "value":"xx" }
 }