workflow: Use more secure pull_request trigger and fix SonarQube #3034
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For a full read: https://securitylab.github.com/research/github-actions-preventing-pwn-requests/
For a tl;dr:
Combining pull_request_target workflow trigger with an explicit checkout of an untrusted PR is a dangerous practice that may lead to repository compromise.
Additionally, fix SonarQube which basically never worked since its introduction.