Add sorting to test.phlask.me

[gcardonag]

In order to make it easier for people to sort the results shown when there are a lot of active tests, we would like to add sorting to the page generated when someone goes to test.phlask.me.

This can be done by adding sort functionality to the table generated here: https://github.com/phlask/infrastructure/blob/main/src_code/test-page-list/lambda_function.py#L96-L120

Since this content is generated and returned by the Lambda function when the page is requested, this new addition should be kept as a simple implementation extending the current content.