Add Snapshpt UI test for WeekView

...rontend/tmss_webapp/src/__mocks__/blueprintsextended.json

.../frontend/tmss_webapp/src/__mocks__/reservation.data.json

...c/__mocks__/scheduling_unit_blueprint_slim_with_task.json

...TMSS/frontend/tmss_webapp/src/routes/Timeline/WeekView.js

...frontend/tmss_webapp/src/routes/Timeline/WeekView.test.js

...p/src/routes/Timeline/__snapshots__/WeekView.test.js.snap

.../src/routes/Timeline/business/timelinegroupingbusiness.js

...nd/tmss_webapp/src/routes/Timeline/data/week.view.data.js

...ss_webapp/src/routes/Timeline/helpers/week.view.helper.js