Development: Shorten e2e test duration

[TheZoker]

Checklist

General

• This is a small issue that I tested locally and was confirmed by another developer on a test server.
• Language: I followed the guidelines for inclusive, diversity-sensitive, and appreciative language.
• I chose a title conforming to the naming conventions for pull requests.

Motivation and Context

E2E tests take about 85 minutes and we want to reduce that run time

Description

This PR reduces the runtime of the E2E test by almost 20 minutes by changing the following:

• Use shorter text inputs for most text exercises and communication tests
• Input the programming exercise code directly instead of typing it (this will also add support for other programming languages in the future 🎉)

Review Progress

Code Review

• Review 1
• Review 2

[4ludwig4]

Code looks good to me, Tests are indeed about 15-20 minutes shorter. I guess you'll resolve the conflicts then no problem from my side to approve it!