fix(api): set difficulty on skill instead of level, weird different naming keep consistancy with existing thing

Author: xav-car

Diff for: api/src/prescription/target-profile/application/api/TargetProfileSkill.js

@@ -1,6 +1,6 @@
 export class TargetProfileSkill {
-  constructor({ id, level }) {
+  constructor({ id, difficulty }) {
     this.id = id;
-    this.level = level;
+    this.difficulty = difficulty;
   }
 }

Diff for: api/tests/prescription/target-profile/unit/application/api/target-profile-api_test.js

@@ -5,7 +5,6 @@ import { TargetProfileForSpecifier } from '../../../../../../src/prescription/ta
 import { usecases } from '../../../../../../src/prescription/target-profile/domain/usecases/index.js';
 import { catchErr, expect, sinon } from '../../../../../test-helper.js';
 import { domainBuilder } from '../../../../../tooling/domain-builder/domain-builder.js';
-import { buildSkill } from '../../../../../tooling/learning-content-builder/build-skill.js';
 
 describe('Unit | API | TargetProfile', function () {
   describe('#getById', function () {
@@ -106,7 +105,7 @@ describe('Unit | API | TargetProfile', function () {
       findSkillsByTargetProfileIdsStub.rejects();
       findSkillsByTargetProfileIdsStub
         .withArgs({ targetProfileIds: ['targetProfileId'] })
-        .resolves([buildSkill({ id: 'monSkillId', level: 18 })]);
+        .resolves([domainBuilder.buildSkill({ id: 'monSkillId', difficulty: 18 })]);
 
       // when
       const result = await targetProfileApi.findSkillsByTargetProfileIds(['targetProfileId']);
@@ -115,7 +114,7 @@ describe('Unit | API | TargetProfile', function () {
       expect(result).to.have.lengthOf(1);
       expect(result[0]).instanceOf(TargetProfileSkill);
       expect(result[0].id).equals('monSkillId');
-      expect(result[0].level).equals(18);
+      expect(result[0].difficulty).equals(18);
     });
   });
 });