Install C# MongoDB driver and check connection to Mongodb

## Summary
- Added step to install C# MongoDB driver
- Checked connection to Mongodb

## Details
- Added a new step to the workflow file `test-windows.yaml` to install the C# MongoDB driver using `dotnet add package`
- Updated the shell for the new step to use PowerShell (`pwsh`)
- Modified an existing step in the workflow file to check the connection to Mongodb using the installed driver

Author: luislobo

.github/workflows/test-windows.yaml

@@ -36,9 +36,13 @@ jobs:
           }
         shell: pwsh
 
-      - name: Check connection to Mongodb
+      - name: Install C# MongoDB driver
         run: |
           dotnet add package MongoDB.Driver --version 2.21.0
+        shell: pwsh
+
+      - name: Check connection to Mongodb
+        run: |
           $connectionString = "mongodb://$env:WATERLINE_ADAPTER_TESTS_HOST:$env:WATERLINE_ADAPTER_TESTS_PORT/$env:WATERLINE_ADAPTER_TESTS_DATABASE"
           $connection = New-Object MongoDB.Driver.MongoClient($connectionString)
           $connection.ListDatabaseNames()