Remove SonarCloud dependencies and GitHub actions

Remove SonarCloud integration from the continuous testing workflow.

* **Continuous Testing Workflow**
  - Remove the `SonarCloud Scan` step.
  - Remove the `SONAR_TOKEN` environment variable.

* **Delete sonar-project.properties file**

---

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Author: maxfriedmann

.github/workflows/continuous-testing.yml

@@ -2,7 +2,6 @@ name: Continuous Testing
 
 env: 
   CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
-  SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}
 
 on:
   push:
@@ -34,8 +33,3 @@ jobs:
         uses: codecov/test-results-action@v1
         with:
           token: ${{ secrets.CODECOV_TOKEN }}          
-      - name: SonarCloud Scan
-        uses: SonarSource/[email protected]
-        env:
-          SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}