feat: Add 'deleteHostSet' method to a target

'deleteHostSet' wraps a host set id in an array and uses
'deleteHostSets' method

addons/api/tests/unit/models/target-test.js

@@ -122,4 +122,37 @@ module('Unit | Model | target', function (hooks) {
     const model = store.peekRecord('target', '123abc');
     await model.deleteHostSets(['1', '3']);
   });
+
+  test('it has a `deleteHostSet` method that deletes a single host set using `deleteHostSets` method', async function (assert) {
+    assert.expect(1);
+    this.server.post('/v1/scopes/o_1/targets/123abc:delete-host-sets', (schema, request) => {
+      const body = JSON.parse(request.requestBody);
+      assert.deepEqual(body, {
+        host_set_ids: ['3'],
+        version: 1
+      });
+    });
+    const store = this.owner.lookup('service:store');
+    store.push({
+      data: {
+        id: '123abc',
+        type: 'target',
+        attributes: {
+          name: 'Target',
+          description: 'Description',
+          host_sets: [
+            { host_set_id: '1', host_catalog_id: '2' },
+            { host_set_id: '3', host_catalog_id: '4' }
+          ],
+          version: 1,
+          scope: {
+            scope_id: 'o_1',
+            type: 'scope'
+          }
+        }
+      }
+    });
+    const model = store.peekRecord('target', '123abc');
+    await model.deleteHostSet({id: '3'});
+  });
 });