test: test manually and create visual tests for Ad-Hoc and Long Term Timeline Pages

[nora-weisser]

Test manually two pages:

1. http://localhost:3000/mentorship/ad-hoc-timeline
2. http://localhost:3000/mentorship/long-term-timeline

As a result of this testing, please submit issues, if there are any.

Also, create two visual tests for both pages.