Changes to Create a webhook for a workspace

added the new path request parameter workspace

api operation id create_workspace_hook was added

added the optional property allOf[subschema #2: Webhook Subscription]/links to the response with the 201 status

the response optional property allOf[subschema #2: Webhook Subscription]/created_at became read-only for the status 201

the response optional property allOf[subschema #2: Webhook Subscription]/secret_set became read-only for the status 201

the response optional property allOf[subschema #2: Webhook Subscription]/subject_type became read-only for the status 201

the response optional property allOf[subschema #2: Webhook Subscription]/uuid became read-only for the status 201

added the new pipeline:span_created enum value to the allOf[subschema #2: Webhook Subscription]/events/items response property for the response status 201

added the new pullrequest:push enum value to the allOf[subschema #2: Webhook Subscription]/events/items response property for the response status 201