Fix CI: new app registration, Kusto resource endpoint, configurable databases

- Use https://kusto.kusto.windows.net as token resource (standard ADX audience)
- Environment variables TestDatabaseName and TestDatabaseNameNoPermissions added to CI
- New app registration d877c9fc with federated credentials for this repo

Author: monishkadas-ms

.github/workflows/ci.yml

@@ -27,7 +27,7 @@ jobs:
           subscription-id: ${{ secrets.AZURE_SUBSCRIPTION_ID }}
       - name: "Run az commands"
         run: |
-              access_token=$(az account get-access-token --resource=${{ secrets.APP_ID }} --scope=${{ secrets.CLUSTER }}/.default --query accessToken -o tsv)
+              access_token=$(az account get-access-token --resource=https://kusto.kusto.windows.net --query accessToken -o tsv)
               echo "ACCESS_TOKEN=$access_token" >> $GITHUB_ENV      
       - uses: actions/checkout@v3
       - name: Setup dotnet