fix for olink tests

[dorotaphanSiili]

PR introduces different way of waiting for messages to be delivered. Instead of sleep(someInterval) a conditional varaible is used with a condition that checks side effects of delivering the message.

141 is resolved with this method

142 is improved, but still not resolved, there are runs on which it doesn't fail but still most of them do

Closes #

📑 Description

✅ Checks

• [ ] My pull request adheres to the code style of this project
• [ ] My code requires changes to the documentation
• [ ] I have updated the documentation as required
• [ ] All the tests have passed

ℹ Additional Information

[dorotaphanSiili]

Accidentally delivered with docs fixes which was based on this branch. Before whitespace fixes and removal of 2 last commits.