Add callback on static vs dynamic checking to SDC Tools Sprint 5 prep

**Which module(s) and week(s) does this change affect?**
Module(s): SDC, Tools track
Week(s): Sprint 5

**What is the work that needs to be done?**

Add a short callback in `org-cyf/content/sdc/tools/sprints/5/prep/index.md` reflecting on static checking being better than dynamic checking, connecting back to the runtime error handling covered in #1946.

**Why is this work important to do?**

Suggested by @illicitonion during review of #1949. Ties the throw/catch error handling trainees just learned back to the benefits of catching the same problems statically.

**Additional context**

**Who might need to know about this change?**

@illicitonion