[Feature] redesign observability tracing test

[kosstennbl]

Currently, for tracing test, we have code that checks if tracing is used as a part of CNF installation, and writes info about it to the config. During the test - config is read and result is given based on written info.

Problem is that adding complexity to the CNF setup process is not ideal (#2036), and from my point of view - we should find another way to check if Jaeger tracing is enabled in CNF.

Also, the tests seems a bit too specific as it is tied to using Jaeger. Maybe some other way could be found.