fix: use assignable type for operations assignee relationship

Author: jwilkinson87

src/main/kotlin/com/ctrlhub/core/governance/schemes/SchemesRouter.kt

@@ -3,6 +3,7 @@ package com.ctrlhub.core.governance.schemes
 import com.ctrlhub.core.Api
 import com.ctrlhub.core.governance.schemes.response.Scheme
 import com.ctrlhub.core.governance.schemes.workorders.response.WorkOrder
+import com.ctrlhub.core.iam.response.User
 import com.ctrlhub.core.router.Router
 import com.ctrlhub.core.router.request.FilterOption
 import com.ctrlhub.core.router.request.JsonApiIncludes
@@ -35,7 +36,7 @@ class SchemesRouter(httpClient: HttpClient) : Router(httpClient) {
      */
     suspend fun all(organisationId: String, requestParameters: SchemeRequestParameters = SchemeRequestParameters()): List<Scheme> {
         return fetchJsonApiResources("/v3/orgs/$organisationId/governance/schemes", requestParameters.toMap(), Scheme::class.java,
-            WorkOrder::class.java)
+            WorkOrder::class.java, User::class.java)
     }
 
     /**

src/main/kotlin/com/ctrlhub/core/governance/schemes/workorders/operations/response/Operation.kt

@@ -1,6 +1,6 @@
 package com.ctrlhub.core.governance.schemes.workorders.operations.response
 
-import com.ctrlhub.core.iam.response.User
+import com.ctrlhub.core.api.Assignable
 import com.fasterxml.jackson.annotation.JsonCreator
 import com.fasterxml.jackson.annotation.JsonIgnoreProperties
 import com.fasterxml.jackson.annotation.JsonProperty
@@ -27,7 +27,7 @@ class Operation @JsonCreator constructor(
     @JsonProperty("cancelled") var cancelled: Boolean = false,
 
     @Relationship("assignees")
-    var assignees: List<User> = emptyList()
+    var assignees: java.util.List<Assignable>? = null
 ) {
     constructor(): this(
         name = "",