Validate Speech Provider

curl --request POST \
  --url https://api-trial.cognigy.ai/new/v2.0/audio/voiceprovider/test \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --data '
{
  "projectId": "<string>"
}
'

{
  "voiceProvider": "<string>",
  "isCredentialsValid": true,
  "msg": "<string>",
  "msgErr": "<string>"
}