Exclude unittests from SAST since it raises unnecessary errors.

Bandit reports for example using the "assert" statement as vulnerability. Inside of unit tests this cannot be circumvented (and should not be).

added bug ci-cd labels

requested review from @m.hock

assigned to @hannes.mayr

restored source branch remove-security-warnings-for-unittests

mentioned in commit 914b8f5b

merged