Up to date high-pT configs (plus bonus json merge script)

configs to run the final high pT results for Run 2 UL and 2022/2023 Run 3. Also adds a script that can merge json files where the first one contains all eta bins except the last one and the second json contains just the very forward eta bin. This allows to have a config with two sets of eta and pT variables to have different pT binning in the highest eta bin. For this the second set of variables has to have the names abseta2 and pt2. The scripts converts to json schema v2 at the same time.