Add SonarCloud Analysis for Frontend

.github/workflows/sonarcloud-frontend.yml

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+name: analyze-frontend-sonarcloud
+on:
+  push:
+    branches:
+      - feature/2-set-up-ci-for-main-branch
+      - master
+  pull_request:
+    types: [opened, synchronize, reopened]
+jobs:
+  sonarcloud:
+    name: SonarCloud
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          fetch-depth: 0  # Shallow clones should be disabled for a better relevancy of analysis
+      - name: SonarCloud Scan
+        uses: SonarSource/sonarcloud-github-action@master
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}  # Needed to get PR information, if any
+          SONAR_TOKEN: ${{ secrets.SONAR_TOKEN_FRONTEND }}

sonar-project.properties

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+sonar.projectKey=jonashonecker_ticketscoutfrontend
+sonar.organization=jonashonecker
+
+# This is the name and version displayed in the SonarCloud UI.
+#sonar.projectName=TicketScoutFrontend
+#sonar.projectVersion=1.0
+
+
+# Path is relative to the sonar-project.properties file. Replace "\" by "/" on Windows.
+sonar.sources=./frontend/src
+
+# Encoding of the source code. Default is default system encoding
+#sonar.sourceEncoding=UTF-8