When importing Test Results to Xray Cloud, we respect the request rate limit

When importing Test Results to Xray Cloud, we respect the request rate limit.

In some cases, when importing several result files to Xray Cloud several requests will be made. When the server reply with a 429 status code, we should check the header of the response for when we should try again to upload the results. We also must have an upper limit of the number of tries to be made (limit: 3 tries).

When we enter a waiting period, a log in the build should be printed with this information.