failing nightly CI job should prevent Pull-Requests from merging

## Brief feature description

To enforce the clang-tidy rules from https://github.com/eclipse-iceoryx/iceoryx/issues/1196 the CI needs to be more strict.
A full scan of all files from a list is done in the [nightly job](https://github.com/eclipse-iceoryx/iceoryx/actions/workflows/nightly.yml).

When this nightly job fails (due to violated clang-tidy rules), it should prevent all Pull-Requests from merging until the nightly job is fixed again.
The nightly needs to offer the possibility to be executed on a feature branch to be able to get fixed.