Fixed typo in TestRunner page

Updated from using random.choices to random.sample throughout where I need a random distinct set as choices does replacement so you can get the same item twice. Discovered in pricing testing.

Added seoarate key for the question count as getting weird results in the counts

Added ability to set the number of testing threads dynamically from the UI

Modified test runner to dispatch requests in parallel to make use of the fact that there is a lot of wait time for the LLM. Defaulting to 16 threads.

Removed a debug print line

Added runner for pricing fact checks to assess the level of fact embedding in the latest model

Added a test runner page which allows you to run a batch of test from the UI