Fix front-end tests + refactoring

General:

• remove unused test system docker-compose
• update package.json with new test packages and updated react-tooltip
• include new test packages in setupTests.js
• update gitlab ci/cd pipeline
• update readme

Test fixing:

• update mocked template schemas with production versions
• remove outdated test data mock + functionality to retrieve it
• remove test console errors for react v17-v18 with mock spy in testHelper.js
• create generic test helper functions
• refactor create.test for Scheduling
• fix found bugs in create for Scheduling via (unit tested) create.helper
• format create for Scheduling

SAS/TMSS/frontend/tmss_webapp/src/routes/Scheduling/create.js

@@ -300,19 +300,6 @@ export class SchedulingUnitCreate extends Component {
         }
     }
 
-    getTaskTemplateForTask(task) {
-        let taskTemplate = this.taskTemplates.filter(t => t.name === task.specifications_template.name)
-        if (taskTemplate[0] && taskTemplate.length > 1) {
-            taskTemplate = this.taskTemplates.filter(t => t.version === task.specifications_template.version)
-        }
-
-        if (!taskTemplate[0]) {
-            throw new TypeError("Cannot load task for SU since there is no task template found for task '"
-                + task.specifications_template.name + "' version: " + task.specifications_template.version)
-        }
-        return taskTemplate[0];
-    }
-
     /**
      * This is the callback method to be passed to the JSON editor.
      * JEditor will call this function when there is change in the editor.