1. Document that CodeMagic branch detection is supported
We need to update at least this page: https://docs.sonarqube.org/latest/analysis/ci-integration-overview/
2. Implement detection of branch and pull request ID when using CodeMagic
We should use environment variables specified on this page https://docs.codemagic.io/variables/environment-variables/
3. Add telemetry for CodeMagic
Nothing to do specifically, already working.